Where are the 3rd party plugins

[JEROMEWAUK]

Help anyone please. On several occasions I've had to perform a clean uninstall / reinstall of Pro Tools software for reasons such as a corrupted third party plugin
to running out of start up drive space etc... nothing particularly earthshaking or out of the ordinary.

However , after reinstalling PT ALL of my 3rd party AAX plugins cannot be located and need to be reinstalled. I'm on a Pro Tools Studio subscription based product.
Clearly , having to reinstall every 3rd party plugin to regain AAX compatability is cumbersome , time consuming , and counter intuitive. I should add , when upgrading PT to the latest version under the subscription model all is well.It's only when a clean installation is performed this occurs.

Logic Pro X does not behave this way with Audio Units when reinstallation is necessary. Am I missing (pun intended) something that everyone else probably knows? I'm on Mac OSX Mojave 10.14.6.

Thanks everyone