The ProgramData folder is by default hidden in Windows. Even if that folder is hidden, then files are installed in it, and it should not be the cause of your issue, that it is/ was hidden.
When you install a Arturia application, then some things is stored to the ProgramData folder, and you can't change that.
Did you at your first initial install change the default application installation path, for the application files, that you can set a new path for?
If so, then i can imagine, there are cases where you could get the issue you had.
(The install path can only be set in the individual installers, and not be changed in a ASC page. And again - keep in mind that it's only some files that's installed on that path.)
And are you also saying, that you now have set the install path to a location inside the ProgramData folder? I will not recommend that.
The default install path for the application in the Program Files folder is perfectly good, and the path should only be changed, if you know excactly, what you do, and you have a good reason to do so.
You can also change the VST2 plugin paths you define yourself. Those paths should be to the folder your DAW and other hosts use. You can't change the install path for VST3 plugins, and that's not something Arturia have decided.
Deleting files in the ProgramData folder can sometimes help on issues. So can a un- and reinstall of the applications. But the error code you mentioned, did'nt point at issues this should help to solve.
Perhaps you'll get that error, if you try to install in the hidden ProgramData folder. You perhaps have done that. But as said, then it's not recommended, that you install applications in that folder. I would avoid it.
To me your issue look like it was a human install issue like this. Can that be true?