Found this on there support area of the site playrequiem.com
If you are having troubles with the Requiem Launcher updating completely or successfully, you will need to try the following:
Remove the following files from your \Gravity\Requiem Installation Directory:
Then enter the \Gravity\Requiem\Patches Directory and remove all files within this directory (If any). Now back out to \Gravity\Requiem once again and run UPDATERUSA.exe. Once the program begins it should re-download all the previously deleted files and allow for you to update successfully.