Run CNEXT.exe as administrator (desktop shortcut may fail – launch from bin folder directly).
: You must install both x86 and x64 versions of the C++ 2008 (VC9) and 2010 redistributables. Install Catia V5 R21 On Windows 11
Create those folders manually.
CATIA R21 uses a local license server (DSLS) even for standalone cracks. Run CNEXT