Updating of FiveReborn failes repeatedly

GTA V version 944 (up to date)
Legit copy of game
Windows version: 10

I have a clean version of GTA V in my common folder. It is titled “Grand Theft Auto V”. I go to install FiveReborn, following the instructions on the download page. I only get to 77 MB out of 580 MB downloaded for the update and then it says this:

I’ve restarted the installer several times and have restarted my PC, too. Nothing seems to work.

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