Big Sur install stuck

Stuck in Installation process or on preparing the Installation ?? There is a difference and thus different possible solutions.

Installation process and two hours - not normal Shutdown by whatever means required. Disconnect all devices and connect to charger. Restart and Immediately hold the Shift key until ate Apple Logo Appear then release. This is Safe mode , does a Repair Disk, clears cache files and only loads Apple Software - load slowly - normal. This may or may not allow the upgrade process to complete and load Setup Assist of Big Sur.

Preparing the Installation - no error message appearing ? Please advise the exact Error Message says.

Yikes - right at this moment - honestly do not know what the cause or solution is.

Will do some research and get back to you.

In the meantime - if fortunate - another More Learned Contributor will jump-in here with a faster solution.

User wrote " But I cannot get into my regular system with all my other applications and files. " meaning one can not log into your user account ??

Possible solution sover here https://appletoolbox.com/cant-enter-your-password-in-macos-big-sur-heres-how-to-fix-it/