stp to cgr conversion is probably related to attempts to either directly convert STP content to CATIA, or just to import STP files to CATIA software. In both cases, STEP format is well-supported in CATIA software so this should be no issue, unless you have no access to the software. In that case your only option is with some of the dedicated CAD/3D model converters.
Updated: August 3, 2023