As projects are imported into ALM 11.52 the users associated with the project will automatically be added to the Site.
Do you use QC authentication or LDAP authentication?
If you use QC authentication, the importing of the projects does not bring the user's password.
If you use LDAP authentication the import of projects does not bring the user's Domain Authentication info.
You could use the Site Admin API for the v10.0 system to extract the users from the source system. Then use the Site Admin API for the ALM v11.52 system to add them to that system.
Any configuration parameters you've set in your v10 environment should also be examined and applied to your v11.52 environment if they are relevant.
Do you use QC authentication or LDAP authentication?
If you use QC authentication, the importing of the projects does not bring the user's password.
If you use LDAP authentication the import of projects does not bring the user's Domain Authentication info.
You could use the Site Admin API for the v10.0 system to extract the users from the source system. Then use the Site Admin API for the ALM v11.52 system to add them to that system.
Any configuration parameters you've set in your v10 environment should also be examined and applied to your v11.52 environment if they are relevant.