If it updated and you’re now without access to your Shadow, which is mentioned in #🔧┃known-issues not to update currently.
You’ll need to reset your Shadow.
https://support.shadow.tech/hc/en-us/articles/32731863175569-How-to-Factory-Reset-Your-Shadow-PC
Shadow
Introduction
You can factory reset your Shadow PC from your account page at any time. This process erases all data and reinstalls Windows, restoring your Shadow PC to its original state. A factory ...