Application -> Modules
Open the Modules dialog box and select Add-Ins.
Check the box next to PARTsolutions
Click Close if you want to activate once
or
click Start... if you want to make the activation permanent.
Add PARTsolutions to the start sequence.
The STL module must be in the start sequence. This is necessary for adding parts to the custom library [User library].
ModelManager / SAP must be placed before PARTsolutions in the start sequence!