I had this also.
Work around - in the "Add-ons" folder is another called "Downloads"
The skin zip files are in there. You can unzip these and then move the files to their respective folders and all the skins will be installed.
Funny thing though - my system was giving me problems and I basically had to wipe my HD and reinstall everything. When I got around to doing OOTP, and did the skins, the download/install worked fine.
Go figure...
