Summary:
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The real Paint.NET, whatever the download site, is 100% free software (small exception in the Microsoft Store), and with a 100% free support forum!
This website is just to help you to choose and download the version of Paint.NET, depending on the exact version of your Windows.
Indeed, the official website only allows you to download the latest version of the moment (links to the official website and the official Paint.NET forum below, for Windows still supported by Paint.NET).
Windows 2000 
Windows 2000 without SP => no Paint.NET !
Windows 2000 SP1 (or SP2) => no Paint.NET !
Windows 2000 SP3 =>
Paint.NET 2.64 [32/64 bits]
[minimums : 2000 SP3 / XP SP1 / Vista]
[Obsolete] MD5 : CED9059739B898C812024E93A5DA8B76
[Obsolete] SHA-1 : 393C360D4F8D5D548BC69C6D4773EEC667AF6778
SHA-256 : B21F93F876F8FBD8DFBBEFADB6B4BD0768A50BAB2D2702BA2A29ECDB7743B668
Windows 2000 SP4 =>
Paint.NET 2.72 [32/64 bits]
[minimums : 2000 SP4 / XP SP2 / Vista]
[Obsolete] MD5: 8116183256A62A3B27474E3918EB9255
[Obsolete] SHA-1: 1A9872278403EE156471DEF61C37F082CA509F49
SHA-256: E0547A12635E1FD6904CA20CEAF1E9E2EDEB0CAAC52774583647BA10A34F197C
Windows XP 
Windows XP without SP => no Paint.NET !
Windows XP SP1 =>
Paint.NET 2.64 [32/64 bits]
[minimums : 2000 SP3 / XP SP1 / Vista]
[Obsolete] MD5 : CED9059739B898C812024E93A5DA8B76
[Obsolete] SHA-1 : 393C360D4F8D5D548BC69C6D4773EEC667AF6778
SHA-256 : B21F93F876F8FBD8DFBBEFADB6B4BD0768A50BAB2D2702BA2A29ECDB7743B668
Windows XP SP2 =>
Paint.NET 3.5.4 [32/64 bits]
[minimums : XP SP2 / Vista /7]
[Obsolete] MD5: 4C873D96CA812E1EEC01B6D3E680F362
[Obsolete] SHA-1: 5FFC52C76959692682C0A849322A959B19C0C693
SHA-256: 7923C978B2535CF6C7A30F283EADCFCED0AF576534AC2C7B9EB025636A8F22F4
Windows XP SP3 =>
Paint.NET 3.5.11 [32/64 bits]
[minimums : XP SP3 / Vista SP1 /7]
[Obsolete] MD5: 3D45CE835587EA768A7F92AAB44EE9A1
[Obsolete] SHA-1: BE96AD057F5C075E6CA0EA7E9E06CABCC75F9602
SHA-256: A7B5A19694318EE40AA2544F544DED7E52487E917063ED5E7971D806616AE802
Windows Vista 
Windows Vista without SP =>
Paint.NET 3.5.4 [32/64 bits]
[minimums : XP SP2 / Vista /7]
[Obsolete] MD5: 4C873D96CA812E1EEC01B6D3E680F362
[Obsolete] SHA-1: 5FFC52C76959692682C0A849322A959B19C0C693
SHA-256: 7923C978B2535CF6C7A30F283EADCFCED0AF576534AC2C7B9EB025636A8F22F4
Windows Vista SP1 (or SP2) =>
Paint.NET 3.5.11 [32/64 bits]
[minimums : XP SP3 / Vista SP1 /7]
[Obsolete] MD5: 3D45CE835587EA768A7F92AAB44EE9A1
[Obsolete] SHA-1: BE96AD057F5C075E6CA0EA7E9E06CABCC75F9602
SHA-256: A7B5A19694318EE40AA2544F544DED7E52487E917063ED5E7971D806616AE802
Windows 7 
Windows 7 without SP =>
Paint.NET 3.5.11 [32/64 bits]
[minimums : XP SP3 / Vista SP1 /7]
[Obsolete] MD5: 3D45CE835587EA768A7F92AAB44EE9A1
[Obsolete] SHA-1: BE96AD057F5C075E6CA0EA7E9E06CABCC75F9602
SHA-256: A7B5A19694318EE40AA2544F544DED7E52487E917063ED5E7971D806616AE802
Windows 7 SP1 =>
Paint.NET 4.3.12 [64 bits]
[minimums : 7 SP1 / 8 / 10 / 11]
[Obsolete] MD5: C355A5829AC1552E152310346918AF9F
[Obsolete] SHA-1: 751E2F9B513DC5489912A4D9AB9E64A7D78EEFF4
SHA-256: FC8D19614F448F5F345219F87F947813E14608B61CDD2812B36A4D1BFC4B2FC0
[32 bits] Windows 7 SP1 =>
Paint.NET 4.3.12 [32 bits]
[minimums : 7 SP1 / 8 / 10 / 11]
[Obsolete] MD5: C4F32ED89AE31A1B0CA00D13EE6F3B8C
[Obsolete] SHA-1: 85B0E3550C527EDAD413422A67C9E28F64CBB025
SHA-256: A9ED61D69A153066E4D19A9D355BBFEC95F4E127C66049EE6BFE53E941FF09DC
[ARM 64 bits] Windows 7 => Although Paint.NET 4.3.12 is compatible with Windows 7 and ARM, there is no ARM-compatible Windows 7.
Windows 8 / Windows RT 
Windows 8/8.1 =>
Paint.NET 4.3.12 [64 bits]
[minimums : 7 SP1 / 8 / 10 / 11]
[Obsolete] MD5: C355A5829AC1552E152310346918AF9F
[Obsolete] SHA-1: 751E2F9B513DC5489912A4D9AB9E64A7D78EEFF4
SHA-256: FC8D19614F448F5F345219F87F947813E14608B61CDD2812B36A4D1BFC4B2FC0
[32 bits] Windows 8/8.1 =>
Paint.NET 4.3.12 [32 bits]
[minimums : 7 SP1 / 8 / 10 / 11]
[Obsolete] MD5: C4F32ED89AE31A1B0CA00D13EE6F3B8C
[Obsolete] SHA-1: 85B0E3550C527EDAD413422A67C9E28F64CBB025
SHA-256: A9ED61D69A153066E4D19A9D355BBFEC95F4E127C66049EE6BFE53E941FF09DC
[ARM 64 bits] Windows RT =>
Paint.NET 4.3.12 [ARM 64 bits]
[minimums : RT / 10 / 11]
[Obsolete] MD5: D53920322C10B315EC7F4D849D155D5F
[Obsolete] SHA-1: D4944CD8A63912D63ACAE0C19ED2386977889999
SHA-256: BD78D3B9E3D8087861BEBDBE79DE97A4194ABCD18EF76E0F9BE11A38C2D50628
Windows 10 
Windows 10 (up to v1803) =>
Paint.NET 4.3.12 [64 bits]
[minimums : 7 SP1 / 8 / 10 / 11]
[Obsolete] MD5: C355A5829AC1552E152310346918AF9F
[Obsolete] SHA-1: 751E2F9B513DC5489912A4D9AB9E64A7D78EEFF4
SHA-256: FC8D19614F448F5F345219F87F947813E14608B61CDD2812B36A4D1BFC4B2FC0
Windows 10 v1809 (up to 21H1) =>
Paint.NET 5.0.13 [64 bits]
[minimums : 10 v1809 / 11]
[Obsolete] MD5: A910361558E67A37451C94C284F9E993
[Obsolete] SHA-1: 94A78D4026D5438FD1332A1EEBDF38691B2994F2
SHA-256: 4730C736870F20DA06A0A322BECFA05EB63E862A7A36385339F54965C911E15A
[32 bits] Windows 10 (up to v1909, then, Windows 10 is only on 64 bits) =>
Paint.NET 4.3.12 [32 bits]
[minimums : 7 SP1 / 8 / 10 / 11]
[Obsolete] MD5: C4F32ED89AE31A1B0CA00D13EE6F3B8C
[Obsolete] SHA-1: 85B0E3550C527EDAD413422A67C9E28F64CBB025
SHA-256: A9ED61D69A153066E4D19A9D355BBFEC95F4E127C66049EE6BFE53E941FF09DC
[ARM 64 bits] Windows 10 (up to v1803) =>
Paint.NET 4.3.12 [ARM 64 bits]
[minimums : RT / 10 / 11]
[Obsolete] MD5: D53920322C10B315EC7F4D849D155D5F
[Obsolete] SHA-1: D4944CD8A63912D63ACAE0C19ED2386977889999
SHA-256: BD78D3B9E3D8087861BEBDBE79DE97A4194ABCD18EF76E0F9BE11A38C2D50628
[ARM 64 bits] Windows 10 v1809 (up to 21H1) =>
Paint.NET 5.0.13 [ARM 64 bits]
[minimums : 10 v1809 / 11]
[Obsolete] MD5: 6D54CD572507DCB971008A5334264342
[Obsolete] SHA-1: F0A5914FA5E01CE3FDE9F835EA3447D2E857852C
SHA-256: A07BD4757F94295671AEB146773F4AC8D56838935BF85A060C65CA32A8A0830E
Windows 10 21H2 (and 22H2) [64 bits] => supported in the latest version of the moment...
Go download it from the official website of the software (or its github, link in the official announcements) https://www.getpaint.net/index.html
Latest announcements in :
Windows 11 
Windows 11 [64 bits] => supported in the latest version of the moment...
Go download it from the official website of the software (or its github, link in the official announcements) https://www.getpaint.net/index.html
Latest announcements in :

Paint.NET is based on the .NET Framework developed by Microsoft. The latter also has requirements on the Windows side, and Microsoft is not always clear about this. The main developer of Paint.NET does not necessarily test all combinations of Windows (especially since the end of SPs).
Therefore, depending on the architecture of your Windows, I am providing here all the downloads I offer, in order of versions, so that you can more easily test them from the newest for your system to the oldest for your system. The order is the reverse of what I list.

Paint.NET 2.64 [32/64 bits]
[minimums : 2000 SP3 / XP SP1 / Vista]
[Obsolete] MD5 : CED9059739B898C812024E93A5DA8B76
[Obsolete] SHA-1 : 393C360D4F8D5D548BC69C6D4773EEC667AF6778
SHA-256 : B21F93F876F8FBD8DFBBEFADB6B4BD0768A50BAB2D2702BA2A29ECDB7743B668
Paint.NET 2.72 [32/64 bits]
[minimums : 2000 SP4 / XP SP2 / Vista]
[Obsolete] MD5: 8116183256A62A3B27474E3918EB9255
[Obsolete] SHA-1: 1A9872278403EE156471DEF61C37F082CA509F49
SHA-256: E0547A12635E1FD6904CA20CEAF1E9E2EDEB0CAAC52774583647BA10A34F197C
Paint.NET 3.5.4 [32/64 bits]
[minimums : XP SP2 / Vista /7]
[Obsolete] MD5: 4C873D96CA812E1EEC01B6D3E680F362
[Obsolete] SHA-1: 5FFC52C76959692682C0A849322A959B19C0C693
SHA-256: 7923C978B2535CF6C7A30F283EADCFCED0AF576534AC2C7B9EB025636A8F22F4
Paint.NET 3.5.11 [32/64 bits]
[minimums : XP SP3 / Vista SP1 /7]
[Obsolete] MD5: 3D45CE835587EA768A7F92AAB44EE9A1
[Obsolete] SHA-1: BE96AD057F5C075E6CA0EA7E9E06CABCC75F9602
SHA-256: A7B5A19694318EE40AA2544F544DED7E52487E917063ED5E7971D806616AE802
Paint.NET 4.3.12 [64 bits]
[minimums : 7 SP1 / 8 / 10 / 11]
[Obsolete] MD5: C355A5829AC1552E152310346918AF9F
[Obsolete] SHA-1: 751E2F9B513DC5489912A4D9AB9E64A7D78EEFF4
SHA-256: FC8D19614F448F5F345219F87F947813E14608B61CDD2812B36A4D1BFC4B2FC0
Paint.NET 5.0.13 [64 bits]
[minimums : 10 v1809 / 11]
[Obsolete] MD5: A910361558E67A37451C94C284F9E993
[Obsolete] SHA-1: 94A78D4026D5438FD1332A1EEBDF38691B2994F2
SHA-256: 4730C736870F20DA06A0A322BECFA05EB63E862A7A36385339F54965C911E15A

Paint.NET 4.3.12 [ARM 64 bits]
[minimums : RT / 10 / 11]
[Obsolete] MD5: D53920322C10B315EC7F4D849D155D5F
[Obsolete] SHA-1: D4944CD8A63912D63ACAE0C19ED2386977889999
SHA-256: BD78D3B9E3D8087861BEBDBE79DE97A4194ABCD18EF76E0F9BE11A38C2D50628
Paint.NET 5.0.13 [ARM 64 bits]
[minimums : 10 v1809 / 11]
[Obsolete] MD5: 6D54CD572507DCB971008A5334264342
[Obsolete] SHA-1: F0A5914FA5E01CE3FDE9F835EA3447D2E857852C
SHA-256: A07BD4757F94295671AEB146773F4AC8D56838935BF85A060C65CA32A8A0830E

Paint.NET 2.64 [32/64 bits]
[minimums : 2000 SP3 / XP SP1 / Vista]
[Obsolete] MD5 : CED9059739B898C812024E93A5DA8B76
[Obsolete] SHA-1 : 393C360D4F8D5D548BC69C6D4773EEC667AF6778
SHA-256 : B21F93F876F8FBD8DFBBEFADB6B4BD0768A50BAB2D2702BA2A29ECDB7743B668
Paint.NET 2.72 [32/64 bits]
[minimums : 2000 SP4 / XP SP2 / Vista]
[Obsolete] MD5: 8116183256A62A3B27474E3918EB9255
[Obsolete] SHA-1: 1A9872278403EE156471DEF61C37F082CA509F49
SHA-256: E0547A12635E1FD6904CA20CEAF1E9E2EDEB0CAAC52774583647BA10A34F197C
Paint.NET 3.5.4 [32/64 bits]
[minimums : XP SP2 / Vista /7]
[Obsolete] MD5: 4C873D96CA812E1EEC01B6D3E680F362
[Obsolete] SHA-1: 5FFC52C76959692682C0A849322A959B19C0C693
SHA-256: 7923C978B2535CF6C7A30F283EADCFCED0AF576534AC2C7B9EB025636A8F22F4
Paint.NET 3.5.11 [32/64 bits]
[minimums : XP SP3 / Vista SP1 /7]
[Obsolete] MD5: 3D45CE835587EA768A7F92AAB44EE9A1
[Obsolete] SHA-1: BE96AD057F5C075E6CA0EA7E9E06CABCC75F9602
SHA-256: A7B5A19694318EE40AA2544F544DED7E52487E917063ED5E7971D806616AE802
Paint.NET 4.3.12 [32 bits]
[minimums : 7 SP1 / 8 / 10 / 11]
[Obsolete] MD5: C4F32ED89AE31A1B0CA00D13EE6F3B8C
[Obsolete] SHA-1: 85B0E3550C527EDAD413422A67C9E28F64CBB025
SHA-256: A9ED61D69A153066E4D19A9D355BBFEC95F4E127C66049EE6BFE53E941FF09DC

I'm providing a small PHP tool I developed to help choose the right downloads, and in which order to try installing them when multiple versions are available.
This is a PHP form with 2 questions. One page for the question 1 => then another page for the question 2 => and finally a third page with the final result depending on your answers.
The questions are simple: the major version of your Windows (with the exact version if possible), and the architecture of your Windows. But if you don't know the answer, or only partially, there are possible answers indicating that you don't know the answer at all (or only partially).

All questions are required (there are 2).