You do not have access to this functionality or Installed Base User is not a valid responsibility for the current user.

Solution:

1. Click the CRM HTML Administration responsibility.

2. Under 'Setup : Users : Registration', click User Maintenance

3. Enter full or partial username and click Go.

4. Select the applicable username from the list

5. Click Roles

6. Select the CSI Normal User role from the left pane.

7. Click Move to put it in the right pane.

8. Click Update.