Offline installers and portable ZIPs for Paint.NET. To download a file, click on the “Assets” expander below.
Release notes: https://forums.getpaint.net/topic/118660-paintnet-43-is-now-available/
The offline installer may still need to download some prerequisites if you’re on a Windows 7 or 8.1 machine that is not up-to-date via Windows Update. You do not need to have .NET installed, as these builds use self-contained deployment.
The “source code” ZIP does not contain any actual files or source code, it is just included automatically as part of GitHub’s “releases” functionality.