SOLVED - How do I revert back to the last stable OS release?

Currently using Beta 7.5.0 on both my rack and toaster. The toaster got locked up with an error message and I don’t want to risk my rack doing the same thing. How do I safely revert back to the last working OS? Do I also need to revert back to an older version of rig manager (I’m using the most current version of that too).

Thanks. I knew where to get the download but wasn’t sure if there was anything specific that I needed to do in order to go backwards in terms of OS. All set now.