I got the same error.

I am not going to engage 650+ mods at a time. I am insane but that insane. I am just having them to be able to play different types of play. Otherwise I have to create more copies of factorio to play different styles of game with different mod configurations.

I have over 900 mods in my list. I took half out and mod updater works. I narrowed it down to a max of 650 mods that the mod updater will work. Anything over that and "Unable to update mods" shows up. Has 404 error. Here is my log file: https://www.dropbox.com/s/hvrx0uc1fwxjrf0/factorio-cu...

Sorry my mistake. Too many things on my mind. I hope fix the 404 error with the mods updater. Since having more than 650 mods seems to cause this other problem.

I have my own custom music mod. I change the ini settings to this: ; ambient-music-pause-mean-seconds=4.000000 ; ambient-music-pause-variance-seconds=3.000000 ; Options: main-tracks-only, interleave-main-tracks-with-interludes, randomize-all ; ambient-music-mode=main-tracks-only My mod works great w...