Opening in Visual Studio 2022 shows "Update the target to .NET Framework 4.8 (Recommended)". Pressing Continue does not produce any warnings or error.

Once loaded the next build step is:

"Build the solution before opening Main.cs (as SettingsPane.cs is a user control that needs to be built before displaying Main.cs)"

Which leads to:

Unable to get MD5 checksum for the key file "OSLTT.pfx". Could not find file 'C:\....\OSLTT\OSLTT\OSLTT.pfx'.

It would be great if you added a GitHub Actions workflow which acts as an executable guide on how to compile the project.