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I use my MacBook Air as a test machine before I install new OSes on either of the MacBook Pros, so I installed Adobe CC, Lightroom Classic, and Photoshop. The extra step for the T2 security chip was new to me, but following the instructions worked perfectly. I won’t go into the details, because there are a ton of tutorials out there. I inventoried the apps currently installed, decided which ones to keep, made sure everything in my iCloud folder was synced up, etc. Once I got it downloaded, I created a bootable external USB SSD (didn’t have any thumb drives big enough, so I used this Samsung SSD drive.) I prefer clean installs so I went through all my usual steps.
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Definitely not the kind of glitch you want to have happen when you release a new operating system, but Apple seemed to get it fixed quickly enough.
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Like a lot of other people, I had issues downloading and installing Big Sur at first.
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