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12:42 AM
There sure is lots of noise around Catalina upgrades failing the past day or two....
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A: Cannot Install MacOS Catalina in Recovery Mode

bmikeWhen you power it off, I would attempt a second time to do an erase install. Hold Option-Command-R at start. Use Disk Utility when you are to the “install” screen - delete all the volumes - especially if you have more than one that says “Data” Then Erase the entire drive - leave Untitled as the ...

Including 5is strange report that Apple didn’t offer suggestions...
Maybe they meant Apple suggested what Idid and they are here for other options?
 
1:35 AM
I can’t recall the last time a forked build cause so many install failures. It looks like a no data loss situation for most.
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A: Cannot Install MacOS Catalina in Recovery Mode

Tony WilliamsThere was a known issue with upgrading or installing Macs with a T2 chip, such as yours, to macOS 10.15.6. Apple have yet to acknowledge the problem but have rolled out (about 3 hours ago) a new update to the software catalog that is reported to fix the problem. Give it another try now.

 

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