I wanted to say this as a result of seeing the error made by one or two other people. I saw that the mod was not shared on some computers. The code erorr_500 prevents the mod from being shared. I don't know why. I had to open a forum on teldon and upload the files from the computer.

Can you give some more information?

Was it one particular mod, and not others?
Are you talking about downloading the mod in game or on the website?
Where were the players located? (may affect download location).