Edge Dev 101.0.1193.0 will not start

bwholl I managed to roll back to 100.0.1181.0 by mostly following the steps on https://docs.microsoft.com/en-us/deployedge/edge-learnmore-rollback

One difficulty is that v100 is no longer available on the download page. Instead, I tried winget

winget install --id=Microsoft.Edge.Dev -v "100.0.1181.0" -e

 While this ended up failing, it did show the URL it downloaded the .msi from, which I was then able to download myself. I'll also note that the msiexec command didn't show anything when it finished (omit the /qn from the command if you want prompts). Launching from the taskbar also didn't seem to have rolled back, but under C:\Program Files (x86)\Microsoft\Edge Dev\Application there was now a 100.0.1181.0 folder, and msedge.exe successfully ran from there (although the restored tabs appear to be from that snapshot in time, and not what I last had open).