Hello again,
I was able to finally migrate to the new server.
I think it is important to add the following notes to the documention, in the upgrade page:
https://www.resourcespace.com/knowledge-base/systemadmin/upgradingBefore opening the ResourceSpace in the browser:
1. Starting from PHP 8.1 and using MySql, default MySql reporting is not MYSQLI_REPORT_OFF, as this will block the database auto-updates implemented by RS. Manually add into include/config.php: mysqli_report(MYSQLI_REPORT_OFF);
2. PHP error reporting should also be turned off. Manually add into include/config.php: $config_error_reporting=0; Reporting erros may also crash the update script.
3. File store before version 9 (correct me if I'm wrong on this), uses a different folder structure. To access the files created in the previous version, manually set into include/config.php: $filestore_evenspread=false;
4. After upgrading, in new version, if in the home screen some tiles return "Resource not found", it means the collection is set as private. Use an user with permissions to set the collection as public as needed.
I hope this can help other people that will migrate from older versions.