If you want, I can provide step-by-step file paths and exact file names for a typical Windows Ubisoft Connect install (I will assume default install paths).
The Ubisoft Connect client is more straightforward but less flexible. Far Cry Primal English Language Pack
If you possess a region-locked DVD version that does not support English via the official launcher, the following manual method is widely used by the community, though it is technically a file-replacement modification: If you want, I can provide step-by-step file
Note: As of 2024, Ubisoft has patched many region-locked digital keys to include English automatically. Attempting manual file manipulation is done at the user's own risk. The Ubisoft Connect client is more straightforward but