revert to previous OS X
How do I revert to previous OS X from 10.13.5? I need to run install and run Final Cut Studio 2
macOS High Sierra (10.13.5)
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Do you bother to read replies to your previous questions? You keep asking the same thing.
Downgrading OS X
Read these links about how to downgrade OS X. They work for any version of OS X, namely, you must do an Erase and Install, what some call a Clean Install. You will need one of these three:
You will need a backup of the older system that you can clone to the startup volume;
a copy of the original installer for the older system that was downloaded from the App Store;
or a bootable USB flash drive installer.
See How to Downgrade macOS High Sierra and macOS Reversion- How to Downgrade from High Sierra.