No database access project zenon 7.6 after install zenon 10

No database access project zenon 7.6 after install zenon 10

hello
I have two zenon 7.6 and zenon 10 licenses
I currently use version 7.6 for my projects,
I wanted to install version 10, everything went well but now I can no longer load my projects in version 7.6 because it tells me that the databases are not accessible while the instances are well encoded (for 7.6 zenon2012 and for 10 zenon2019)

do i have to add a parameter in an ini file?