Could not copy files for Tranquility

I saw this fix on the forums from last year. It works for me.

Sep '17

If there are no reported problems then please try the following steps. Please note that this will erase the accounts from the launcher and you will have to relog them.
Close the launcher if it is running.
Please press the windows key + R to open a run window.
Copy and paste the following into the run window and press enter.
%LOCALAPPDATA%\CCP\EVE
Right click on the folder named ‘cache’ and delete it.
Right click on the folder named ‘QtWebEngine’ and delete it.
Start the launcher and see if the issue persists."

All I had to do was delete ‘QtWebEngine’ and was fixed