Current version of translate5 runs only with PHP 7.3. If you update from PHP 5.6 to 7.3 it can happen that install and update script complains about the wrong PHP version.
If this is the case, just unzip the translate5.zip in you application folder and confirm that all files should be overwritten. This affects only the application files, no user data.
After that the install and update script should be runnable runable again.
Update the file tree and database structure