If the installer throws the filelist.xml.txt error, it is likely looking for a folder named "data" or "bin" that contains the game's massive .dat or .fat archives.
Go to "Games," select Far Cry 4, click "Properties," and choose "Verify files."
Third-party overlays are known to interfere with how Far Cry 4 loads its initial manifest files. If the verification didn't work, try these steps: