Unable to complete version check. [30410][30607][20457][404]

[PondHollow]

So I just downloaded the latest patch (March 9th-10th update). Just as it finished, there was a BSOD and now upon logging in in the launcher I'm met with the following error:

Unable to complete version check. [30410][30607][20457][404]

The following do NOT solve the problem:

• Changing BootVersionConfigMode
• Launching in Administrator Mode
• Running in XP Compatibility Mode
• Using a backup version of Final Fantasy XIV - A Realm Reborn/boot. This causes the launcher to reupdate the contents of that folder, but once I can log in again, the problem returns.
• Deleting the contents of the game's My Documents/Games folder. As far as I can tell this has no effect at all, which is very unusual for launch problems I've encountered, because the download to refill the contents of that folder doesn't even start; it just jumps straight to this error.
• Restarting the computer.
• Restarting the network.
• Everything in the relevant knowledgebase article -- https://support.na.square-enix.com/f...=1&c=59&sc=364

I'm hoping I can find a solution other than total reinstallation, which takes me days.

I suspect that there might be a solution involving changing the launcher file, since the error doesn't include any sqpack information. Is there a file check tool (other than, lol, the launcher)?

Edit- I'm on PC. Windows 10.