However, just to let you know, Fsdt software by default suggests to install it in a programs files x86 folder (which i never install nothing there, because it's the OS untouchable folder, that's what i've seen in all kinds of forum, not just p3d and 3rd party involved).
The suggestion to install a software outside C:\Program Files it's a generic suggestion, which is usually valid if you are installing a very OLD software, one that was made before Windows Vista ( when UAC was introduced ), and the reason is suggested to do so, is that non-compliant software might want to try to WRITE something inside "its own" folder and, if this is folder happens to be under C:\Program Files, you'll get the issue of the supposedly "untouchable" Windows folder.
Our software doesn't do anything like that, because it's 100% compliant with the latest Windows standards, so it will never, ever, write *anything* inside "its own" folder. Instead, it will use the folders suggested by Microsoft, in the most compliant way. That is: using %APPDATA% for small text configuration files, and %PROGRAMDATA% for larger binary files that might change while the software is running, like the airport cache.
In addition to that, our installer correctly sets the proper user permissions on the Addon Manager folder, so the Live Update will be able to update files there in the future.
So, you will not have any problems installing into the default suggested location.
The only time you might want to change it, is if you are low on space on the C: drive. In that case, it would be best to choose a separate folder, such as D: or E:, which will result in the Addon Manager installed into D:\Addon Manager or E:\Addon Manager. This is perfectly fine too.
The worse possible choice, is installing inside the sim. Not because of specific problems but, because in case you want to reinstall the simulator clean, you'll have to lose the FSDT installation too, something that wouldn't be the case if you install outside of it.