Where does Adobe CC stores the 3rd party UXP-Plugin information for Photoshop in Windows?

[Thorsten_dev]

For some installation check I need to know where my UXP-Plugin is stored, because I need to read the manifest.json to get the version-number.
On my PC, I found it at 
C:\Users\[YourUsername]\AppData\Roaming\Adobe\UXP\Plugins\External

However, on other PCs (namely on a customer PC), this path is empty, but the Plugin is installed in
C:\Program Files\Common Files\Adobe\UXP\Plugins\External

What are the rules for CC to decide on what place it should be installed?

[ThioJoe]

I don't quite know the answer, but I do know that when installing a program in Windows in general, the program will go into the AppData folder when it's set to be installed for the current user, but into Program Files for all users. So that might be a hint.

I'm not familiar with the UXP Plugin installation process like whether it gives you an option to install just for the current user or all users, but if there was such an option presented when installing it, I bet that would be the reason. It could also possibly be affected by whether you run the plugin installer as admin or not, but that's just a thought.

Looks like in this article under "Where are plugins installed?" it does mention the two locations you did, but doesn't exactly say the reason for each besides that the user level location (AppData) is the default. I'll try reading more into and updating what I find if anything.