Testing FileSite 64-bit, I ran into an issue on my own PC. I had 64-bit Office 2016 installed, but the FileSite installer refused to continue and presented me with the following message:
In an attempt to locate the cause of the issue, I fired up the trusty Sysinternals Process Monitor, and set up a filter to capture activity from msiexec.exe. I then further refined that filter to capture only RegQueryValue operations, and re-ran the installer.
Sure enough, Process Monitor picked up some instances of the installer reading from the registry to determine the ‘bitness’ of Office and other iManage products. In my case, there was a lingering registry entry that led the installer to conclude that I still had the 32-bit version of FileSite installed:
Because I didn’t have any iManage products installed at the time, it was safe for me to delete the entire HKLM\SOFTWARE\WOW6432Node\Interwoven reg key.