Automotive OEMs specify exactly which CATIA-Version we have to use.
These CATIA-Versions differ from OEM to OEM. (e.g. R24-SP03-HF88 vs. R26-SP03-HF42 vs. R26-SP05-HF24)
From Windchil 10.2 M030 the WGM checks for exact version match of CATIA integration (down to hotfix-level).
Windchill also supports only one instance of CATIA on one client.
Taking the "supportet way" would lead us to to different clients for each of our customer!
As mentioned in #CS131209 we want to place this highly recommended feature-wish as an "idea"