@HISEnberg You can create a self signed certificate and sign the AAX plugins with it. It’s free and works for me for years. Just create a self signed certificate on yor Mac using your Apple Developer account. Then transfer it to Windows pc, use this certificate for AAX code signing.
Other than AAX, I don’t code sign vst or installers on Windows for years. It’s not necessary.
Considering that even some big companies in the industry do not make codesign for Windows, I think it is an unnecessary process. All Windows users know how to bypass the blue window that appears when the installers are opened, there is no need to spend money just for this. Also, the installation is already very difficult. As I said, I have not used it for years and, I do not think you need to waste your money.
If Windows makes it a “must” in the future, just like Apple did, then we can talk this. But at least for now, no need to do it