A little history for future users. Hopes it will help and save your precious time.
Disk space Ok (more than 200GB free space), Simple uninstall-install didn't help. Resetting settings, no luck.
I did "Clean Reinstall":
1. Uninstall Photoshop
2. Manually remove leftovers (I removed related Photoshop Folder): a. Windows 10: Users/[user name]/AppData/Roaming/Adobe/Adobe Photoshop [version] b. [disc your program are installed. mine is C:]\Program Files\Adobe\Adobe Photoshop 2021.
3. Restart your PC.
4. Install Photoshop:
a. Disable all imports and etc. on installation "popup"
b. Same on the second "pop up" window.
After installation Photoshop started without problem and errors. At least for me...