I managed to replicate the problem and tested the fix. Still, it wouldn't hurt to verify that it works in your case. If it isn't too much hassle, and since you already downloaded 7zip, you can zip into multiple files constrained by size. It's right click -> 7zip -> Add to archive... , and write 390000 in the "split" field. But if it doesn't work, no biggy, and thanks for the involvement!