I couldn’t find any information that is there any obligation for minimum value of forest admin package versions like forest-express-mongoose ?
I’m sorry I’m not sure I understood your question.
Do you mean is there any minimal version for the Forest Admin packages to work ?
I want to upgrade my development workflow to 2.0 but I am asking that is there any minimum version requirements for the forest-admin packages to upgrade it ?
No requirement 
you can go. We always display requirement on the UI if there is any 