High-DPI scaling conflicts on modern high-resolution screens.
Check the box at the bottom for . Click Apply and OK . install catia v5 r21 on windows 11 fixed
Legacy software relies on specific C++ redistributable packages. Download and install both the x86 and x64 versions of Visual C++ 2008 (VC9) and Visual C++ 2010 (VC10) directly from the official Microsoft support page to prevent start-up errors. High-DPI scaling conflicts on modern high-resolution screens
Because CATIA V5 R21 was engineered for older operating systems, running the installer raw will often trigger security blocks or instant crashes. You must prepare the OS first. install catia v5 r21 on windows 11 fixed