I've figured out what the problem is with my downloading. I tried it again this morning and it still won't download anything, even though it did two days ago. I'm using Micorsoft Edge and that seems to be the problem. I installed Google Chrome and tried to download from Renderosity Freestuff and it works. So, between now and two days ago, something in Microsoft Edge broke and I wasn't able to download from Renderosity anymore. If anyone else is having problems and you're using Edge, that might be the problem.