You have complete freedom to install everywhere you want, in every folder or drive, but all FSDT products MUST stay together, and the installer enforces this so, if you see the installation path greyed out, it's because you chose to accept the default location under C:\Program Files (x86)\Addon Manager when you installed another FSDT product earlier.
If you changed your mind and want to "move" all your FSDT installation, you MUST do the following:
- Uninstall all your FSDT products
- Reply YES to the question "Do you want to remove the Addon Manager ?" - this is the important part, which allows you to re-select the installation path again.
- After you Uninstalled everything, reinstall every FSDT product you have, and you'll see the folder won't be greyed out for the first FSDT installer you start.
Activation won't be affected in any way.