The assembler project is now built exclusively for .NET Core 3.1 and it's a single portable package for Windows, macOS and Linux, running on X86, X64 and ARM architectures.
With this step, the code base and the release package are simplified. All you have to do is install .NET Core 3.1 once and you're good to go. You may also follow the guide How to Install .NET Core on Linux and macOS (and Windows) if necessary.
The .NET Framework 4.7 version is now discontinued. Microsoft basically deprecated the .NET Framework, with the next version they will merge everything into .NET 5.0. Hopefully at that point Windows Update will install it for everybody on Windows, but until then .NET Core needs to be installed manually to make Retro Assembler work.
For simplicity, the assembler's version number has been changed to the modern style Year.Release, kicking off with 2020.1
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See the documentation for details.
Download the latest version from the Retro Assembler page!