Script error when trying to launch FFXIV

I've been playing FFXIV through Steam for almost a year now with no trouble, but tonight when I tried to launch the game I got an error that read

Script error

An error has occured in the script on this game.
Line: 1
Char: 1
Error: Invalid character
Code: 0
URL: https://launcher.finalfantasyxiv.com...47b3.bundle.js

I did look into previous threads concerning similar error codes, but majority of solutions invovled Internet Explorer which has now been completely replaced by Microsoft Edge.

So far I have

- Deleted and re-downlaoded Steam
- Deleted and re-downloaded FFXIV (just the launcher though since I can't get past the title screen)
- Cleared Edge's cache multiple times
- Set Edge's tracking prevention to Balanced
- Set exceptions for the game on both antivirus program and Firewall settings
- Restarted my computer multiple times while testing solutions above

Thank you in advance.

Good morning! Thank you for posting in the Final Fantasy XIV Technical Support Forums.

We are sorry to hear that you are having trouble launching the game due to this script error. It seems that the game launcher is having trouble loading up properly. I would recommend trying out the following troubleshooting to see if it may help with this issue that you are currently experiencing:

1. Open the Control Panel, and go to ‘Network and Internet’. Once there select ‘Internet Options’
- Under the "General" tab, please delete ALL browser history.
- Under the "Security" tab, please move the slider to the lowest possible settings or no higher than "Medium"
- Under the "Privacy" tab, click “Advanced” and select ‘Accept’ under both First Party and Third Party Cookies.
- Under the "Advanced" tab, please make sure that "Allow software to run or install even if signature is invalid" is CHECKED.
- Make sure that all SSL and TLS (EXCEPT SSL 3.0) are CHECKED. [SSL 3.0 should be UNCHECKED]
- Hit "Apply" to save the settings, and then "OK, to close the Internet Options menu.
- Right-Click on the FFXIV launcher icon and select "Properties"
- Hit "Apply", then "OK" to save the changes.
- Please RESTART your PC after. Once restarted, try running the game as an administrator.

2. Please disable any programs and overlays that may be running in the background of the PC, including anti-virus programs.
3. Perform a clean boot by opening your Task Manager, and selecting the Start Up tab. Once there, disable everything listed, and restart the PC. This will help minimize the chance of another program interfering with the client.
4. Lastly, if the following troubleshooting above does not resolve, it may help to try a clean uninstall and reinstall of the game.

I hope this helps! Thanks for posting in the FINAL FANTASY XIV Technical Support Forums.