Tamas, thank you for the quick response. It turns out the International version of AC 26 was originally installed. I have uninstalled it and installed the USA version and updated to 7001 successfully.

Hi Tamas, I have clients running AC 26 and Sonoma on both Intel and Silicon Macs. I downloaded the preview updater for 26 and the intel version runs fine. The Silicon version doesn't work, however. When I run it, it says there is no AC 26 installed i...