Turbotax 2021 doesn't open after update: stuck on blue splash screen

[polkaroo]

I updated Turbotax today as requested by the app, and when I try to reopen it, it's frozen on the blue "intuit Turbotax" screen.

I've downloaded the updated installer from https://turbotax.intuit.ca/tax/software/install, uninstalled and reinstalled and still stuck. Task manager shows 0% CPU usage after 10 minutes on the same screen. Using Windows 10 21H2. 

I don't have an older installer so I can't rollback to the previous version!

[polkaroo]

Update: reinstalled again, rebooted, and it works fine now.