If you buy Paint.NET in the Windows Store, you'll be supporting its development directly (normally we ask for a donation).
The Windows Store version of Paint.net is available for $8.99 regularly, but currently for an introductory price of $5.99.
https://www.ghacks.net/2017/10/01/paint-net-lands-in-windows-store-but-is-not-free/
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freeware v4.0.18 no windows store
https://www.dotpdn.com/files/paint.net.4.0.18.install.zip
The Windows Store version of Paint.net is available for $8.99 regularly, but currently for an introductory price of $5.99.
https://www.ghacks.net/2017/10/01/paint-net-lands-in-windows-store-but-is-not-free/
--
freeware v4.0.18 no windows store
https://www.dotpdn.com/files/paint.net.4.0.18.install.zip