Did you ever solve the issue? I encountered a similar issue with my R5 and Capture One and my Dell XPS 15 2-in-1 after I updated to Windows 11. By the time I used C1, I was past the rollback period. The only software I could use was EOS Utilities, which was OK, but I needed other options for tethering at times. Eventually, after battling this for nine months, I bit the bullet and bought a new computer. Problem solved. That said, I haven tried tethering my R6 II. I’ve just finished a week-long shoot in the studio using my R5 and C1. Had I seen this before, I probably would have experimented the end of one of the days. My other issue may be I’m using the last version of C1 for which they issued a perpetual license. I won’t do a subscription for C1.
I haven’t tried tethering with Lightroom. I’ve always found it a bit clunky compared to several other programs I own. For programs like C1, I do a new session each day, otherwise it bogs down with all my shots. (I shoot around 400-600GB on a week-long shoot.) Lightroom would be even worse because of the database overhead. I can suggest a couple of other tether programs that might work and are not as costly. One is Smart Shooter 5, which you can buy through Tether Tools.
