Download old macos installer

Splashtop admin login

If you're willing, you can few things that you can able to legally download it.

Remote control mac computer

This will add the relevant macOS installer to your Applications folder. That could also be to do with the October 24 expiration, and if so, it's hard to see Apple bothering to do anything about an OS from nearly 15 years ago. Click again to start watching. I'd suggest this is a parallels install issue and you may want to use their support. If you need to run an older version of OS X to use the older third-party software, consider looking for alternatives that run on the latest versions instead.