That approach will not work. You cannot mix language database versions with a different program executable version.
ISTA is very strict about version matching. The
TesterGUI.exe for 4.57.21 expects databases specifically structured and tagged for 4.57.21. Using 4.37.20 databases—even if you try to edit internal tags with DB Browser—will cause the crashes and hangs you are experiencing because the internal schema or data structure often changes between versions.
To get Italian working on 4.57.21, you
must find the native Italian SQLite files specifically for version 4.57.21.
You need to search for a download that contains the "SQLiteDBs" pack for 4.57.21 that includes these files:
streamdataprimitive_IT.sqlite
xmlvalueprimitive_IT.sqlite
Once you obtain the correct files for your specific version, just drop them into your
\ISTA\SQLiteDBs\ folder. Then, launch ISTA, go to configuration, and select Italian.