You can change your Tally.ERP 9 Single User rental edition to Tally.ERP 9 Multi-User, or vice versa.
To change the product edition
1. Right-click tally.exe, and select Run as Administrator.
2. Click F12: Configure > Licensing > Change Product Edition. A message appears, click Yes.
3. Press Enter, to view the Change Product Edition screen, as shown below:
4. Press Enter to change the edition. The product edition details are displayed in the Information Panel.