How can I get Mojave?
Is it ok to upgrade from High Sierra to Catalina, or should I upgrade to Mojave?
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It can be done, but I'd take it one step at a tine & Catalina us a huge jump.
Don't use FireFox for this link…
https://itunes.apple.com/us/app/macos-mojave/id1398502828?mt=12
If you get a corrupted message...
Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS Mohave App in Applications, so expired Certificates are not expired.
Or... trash the Install MacsOS Mojave.app in Applications then a new copy can be downloaded.