i can't install caustic 3 on android 10. it says this app made only for previous android version
Well that's not the end of it. You can still use a Mastering App on Android 10. At least I think so. I don't know for sure. Caustic can work on windows 10 newest version. So it's not totally deleted. Caustic is very strong beast and very hard to kill.
Nope it will install on Android 10, you have to enable "Use legacy Permissions" and that is for this file system mess Google has created with the public directory.
My apps are up against the same stuff and I am updating them, it's no secret I have been in contact with Rej about the file system "stuff"...
Researching futher, this is either 64bit support/build SDK warning or the filesystem.
Which all of the following require an update but nothing above stops your app installation unless your device is a 64bit CPU only.