There is no need to uninstall the trial version of iGrafx when you purchase the full version of the iGrafx product.
You will simply need to add the correct license key(s) in iGrafx to enable the full functionality. To add the correct license key:
- Start iGrafx
- From the Help menu, choose About iGrafx
- Click on the Add or Manage buttons and enter your key(s)
If at some point you want to upgrade to a future version, the installer will do whatever uninstalling that is necessary to move you to the correct version before it installs the new software.