If you do get the chance to reinstall BlenderBim, please do let us know the results.
Additionally, if you can let us know what version of BlenderBim you did have installed originally, that might help our investigation. But no worries if its too late to check now
Even just Updating BlenderBIM AddOn usually means :
deactivate BlenderBIM first
Restart Blender
Uninstall Blender
from that point you can reinstall or update BlenderBIM from external Zip File again
If you forget the deactivation before and the Blender restart,
Blender will not delete all previous AddOn components and following installation
will usually corrupt.
So maybe that (tedious) procedure may also help or be needed for Speckle AddOn
reinstallation in some cases ?