It seems to be downloading really slow, then speeds up without me noticing and finishes and then announces it has corrupted files.
I think it may just give up partway through so the files are not fully downloaded... And as for the download manager, its just the normal windows one. However i can try with a firefox one or maybe the rapidshare link.
Posted after 13 minutes 8 seconds:
thanks for the suggestions
i have the test build now! I think it may have been that so many people were downloading the marvalous CC or something like that. I tried with other download managers but they did the same so i used the external download link and found that it worked much better!