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In the PARTsolutions installation routine, in the CAD integrations selection dialog box select the desired interface (here in the following figure exemplified with CATIA V5R20).
After the installation the interface directory is found under $CADENAS/iface/catia ($CADENAS stands for the installation path of PARTsolutions).
In the directory "catia" you can find another directory named according to the respective CATIA version like "V5R20" for example.