In case it helps anyone, here are the steps I followed after reading threads about the interaction with MacOS 15 and Fusion (Win 11 Guest OS) running on a 2019 Intel MBP.
I had been running MacOS 14.7.1 with Win 11 running on Fusion 13.6.0 and all was well. I have a fixed IP address from my router for the MBP and Fusion using Bridged Networking. (Backed up this version of both the entire MBP and the VM.)
First I upgraded to Fusion 13.6.1 using the "Check for Updates" menu option. 13.6.1 updated with no issues.
I then ran Fusion 13.6.1. I wasn't prompted to answer any questions re: copying or moving. Started Win 11 and shut down without any issues. (Backed up again at this stage.)
I thine upgraded to MacOS 15.1.1. Confirmed that I still had a fixed IP address and Private Wi-Fi "Off" for my home wi-fi networks. Started Fusion and wasn't prompted to answer any questions. Shut down and ran again with no issues. (Made a back up at this stage in case I run into issues until my next weekly update next week.)
Not sure if it's coincidence or whether the sequence of upgrading and/or fixed address made a difference. In any case, hope this is helpful to others.
Follow-up Dec 2, 2024:
Well that didn't last long! Received a message asking if I had copied or moved the file. I chose "moved" and Fusion started and Windows 11 guest ran fine. Closed Win 11 and Fusion and restarted with no message so fingers crossed.
Not sure if it's a coincidence or not but when my MBP had woken from sleep (which is when I was asked if I had moved or copied the file), my MBP's systm clock (set to automatically set the time) was about 25 minutes behind. Strange incident that occurred about 2 weeks ago (before installing MacOS 15 or updating Fusion). After I resolved the issue with Fusion the only way to have the clock be on the correct time was to shut down the MBP and restart. Clock on time and started Fusion again (with no message this time).
Hope this issue is resolved however am not so optimistic at this point.