Hi! I'm not positive, but I'm pretty sure you should be able to upload from any pc as long as you have logged on to the site on that computer. I typically log on to Renderosity from 3 different pc's every day - 2 at work and one at home - and am able to answer e-mails and make comments from any of them and I don't see why it would matter which pc one uploads from. I don't think the site software cares which particular pc you are using - just as long as you have logged on. (hope I don't turn out to be full of crap by saying this! lol I'm pretty sure I'm right, though...)