For clarification, I am referring to the FT817 Companion Android application, not the FT817 Commander Windows program (I mixed these up in earlier posts in this thread) however I have FT817 Commander installed on my Windows 10 laptop and if I rememeber correctly, I had to install it in admin mode (i.e. run the setup.exe program in admin mode- right mouse button click on the executable and select run in administrator mode) before it would install. You might want to try that.So far I have only used FT817 Commander to backup the memory channels but as far as I have seem so far it works fine.
As regards the BT link stopping working, with the FBT06 adapter, I have found it is best to have it plugged into the FT-817 before you switch the rig on, rather than plugging it into the rig when it is already running. In the latter case the laptops bluetooth doesn’t always pair with the dongle.