The Ultimate Edition includes the Vaas, Pagan Min, and Joseph Seed DLCs. These are usually accessed through the televisions found in the main guerrilla camps. To give you more specific help, let me know:
Before you run the setup, ensure your system is ready to prevent the installer from crashing. Far Cry 6 Ultimate Edition v1.5.0 MULTi15-DODI....
Ensure your Page File size is set to at least 16GB (System Managed is usually best) to prevent "Out of Memory" errors during decompression. The Ultimate Edition includes the Vaas, Pagan Min,
You need roughly 60GB to 100GB of free space depending on whether you include the HD Texture Pack. The Ultimate Edition includes the Vaas
Real-time protection often flags the Empress.dll or unarc.dll files as false positives. Disable Windows Defender or your 3rd-party AV temporarily.