Hi, Dunno if this is by design, but a lot of installers don't play well when installed from standard user account with elevated privieleges. Firefox installer on Windows 10, when ran from GUI or admin PowerShell, accesses AppData fodler under standard user account that started the elevated process. Thus, it's not possible to install it if admin account doesn't have access to user folder, as on my system it doesn't for security reasons. It's a minor inconvenience to need to explicitly log into admin account and do it there. But as this is a disease among installers I'd rather have them play well with normal security. You may disagree here, and I understand if you do. Just pointing it out.