Installed Myst V End of Ages on from GOG on Win10. Runs fine. However, I always get the "unsigned" windows warning and I always have to respond to the "which language" prompt. Both of these are a pain. Tried various work arounds for the first issue with no success. Don't know if there is a work around for the language thing.

Running Win10x64 build 17692 (RS5-Insider's build) and the language prompt needs but a single mouseclick, and I don't get any other warning or prompts at all--and I don't run it in Admin mode, either. Don't know what an "unsigned" windows warning is...;) Perhaps you are on an earlier build of Win10 and that may be the cause. At any rate the language prompt is less annoying by far than the intro clips, imo.