If your old data doesn't appear, use the "Import" function found in the Settings menu to manually point the software to your previous database folder.
Here is the information regarding the download and installation: m centers 8.0 download
Based on the name, this is most likely related to the application used in the Netherlands for participating in medical studies (MRI scans, psychological tests, etc.) managed by the Leiden University Medical Center (LUMC). If your old data doesn't appear, use the
Navigate to the official developer portal. Search for the "Downloads" section and select the package corresponding to your operating system. If your old data doesn't appear