I'm getting 430 KB/sec on a 15/5 line. Takes me less than a minute to download a 45 mb file. Not sure where the issues you're describing are coming from, but from what I can tell the bottleneck isn't on Renderosity's end.

Your measurement for downloading is a bit vague. Is it Kb/s or KB/s? If it's 12 Kb then that would be the equivalent of a 14.4 baud modem. Here's a website with more info on download measurement speeds. It's an older site but the info is still pertinent:

About Network Speed.

I happen to actually like having the vendor's name at the beginning of the file. Saves me the trouble of remembering. It's not exactly like my archive system, either, but, after all, it's a freebie - so I don't sweat it.

As Bobby* said, sorry you feel that way.

Brynna

With your arms around the future, and your back up against the past
You're already falling
It's calling you on to face the music.

The Moody Blues

Dell Desktop XPS 8940 i9, three 14 tb External drives, 64 GB DDR4 RAM, NVidia RTX 3060 12 GB DDR5.
Monitor - My 75 Inch Roku TV. Works great! 
Daz Studio Premier 
Adobe Creative Cloud - newest version