The error message “Could not copy files for Tranquility” means that the files in your shared resource cache folder are either in use or being updated. If the issue does not resolve itself in a few minutes try restarting the computer, as that will kill any ghost process that may be preventing the launcher from updating files. If that does not resolve the issue then try deleting the tq folder from within the shared resource cache folder. I’ll provide step by step instructions below.
- Start the launcher.
- Click on Settings in the left sidebar.
- Click on shared Cache Settings.
- Click on show in explorer.
- Right click on the folder tq and select Delete.
- Close file explorer.
- Restart the launcher.
If that still does not resolve the issue then I suggest you delete the ResFiles folder from within the Shared resource cache folder. But be warned that this will mean that you have to redownload most of the game files again so that will mean a huge download.