Hello Bob,

another thread on the forum you solved concerning a similar issue which I got to work only with Admin rights, wasn't ultimately due to the problem you found with that user. I recognized that it should not require admin rights, so I pressed on and solved it so: right clicking the ACP & Scheduler short cuts > properties > security > [my user name] and setting full control [it was special permissions]. FM4 and Maxim were fine on install. Why it wasn't so, I do not know. Why was I installing ACP years later? I had ACP 8.1.1 on Win XP, and finally ditched it and moved to a Win10 new PC. It's been an experience! particularly my 3 DIY ASCOM drivers for focuser, dome and scope (buried in the rev notes of ASCOM was the reason... I digress).