In some cases, you may need to uninstall the Manager application.
The following instructions allow you to do this task.
ATTENTION
Uninstalling does not delete the data file.
If you have a malfunction due to a damaged data file, uninstalling and reinstalling the manager will not fix the problem.
See the following article on "How to erase or reset the data file"
Reinstall, Clear database, Re Register
See the following article for the error "No username"
No user name in Manager drop Box
Step 1
Right click on the Windows logo
Step 2
Click on settings 
Step 3
1- Write Triplogik in the search box
2- Double click on the program in the list
3- Click on uninstall and follow the instructions
If you get an error message about Windows being unable to uninstall
Please consult the folowing references to fix the windows issue
Impossible to remove previus version when updating or unable to uninstall