Stuck in endless update cycle

Add swtor.exe and launcher.exe to your Firewall / Anti-Virus safe list, next if that doesn't work, try the below steps and should be similar if your on Windows 10:

1. Run the launcher and log in.
2. Open the task manager on your computer (shortcut is Ctrl+Shift+Esc).
3. Select the Processes tab. On Windows 7, sort by image name and look for any starting with "br", they should be listed as belonging to Bitraider in the description column. In Windows 8.1, scroll down to the Background Processes and look for any Bitraider listings. Right click and end them. Don't worry if they come back.
4. Select the Services tab. In Windows 7, click on the button in the lower right corner that says Services. In 8.1, click the link at the bottom that says Open Services.
5. In the Services window, sort the list by the Name column, and look for BitRaider Mini-Support Service. Right click on it and select properties.
6. On the General tab, about halfway down, there should be a dropdown menu that says Startup type. Make sure it is set to "Automatic". Hit Apply the OK.
7. Close the Services window, the task manager, and the game launcher. Then restart the entire computer.
8. When computer has restarted, run the launcher and log in. The download process should now start properly.