The recommended upgrade steps for Simplify Suite are:

1. Uninstall Simplify Suite
2. Restart Server
3. Install new Simplify Suite

In the event you cannot restart the server follow these steps:

1. Uninstall Simplify Suite
2. For 32-bit, in C:\Windows\System32\Spool\Drivers\w32x86\3 delete sd4ui.dll and sd4drv.dll. For 64-bit, in C:\Windows\System32\Spool\Drivers\x64\3 delete sd4ui.dll and sd4drv.dll. If these files cannot be deleted then rename them (for example rename sd4ui.dll to sd4ui.old).
3. Install Simplify Suite

These steps are instrumental for Simplify Printing. Without following the correct directions, the ScrewDrivers driver may not patch. Printers will not create if the driver does not upgrade. Always test after upgrading Simplify Suite.