1. Run TCS and go to Help | About TCS. This will show you where your current database is located.
2. If you are wanting to migrate an database from a previous TCS version it is highly recommended you create a backup from the older version of TCS before continuing.
3. Open up the latest version of TCS | Data | Replace database and locate that directory or a similar directory for your previous installations of TCS database.
3. Old databases are named cricket_v1.mXX where XX is a number. Locate the largest as this is likely to be your old one.
Note: all databases are always backed up if replacing or creating a new one etc.