Theme help?

[solskenn]

Okay, I have found a theme or two that I would like to install on my website.
I have downloaded them, then I have tried to upload them. However it doesn't seem to be working...
Even when I manage to get it visible via the FTP, when I try to follow the directions for the link value to install it to the site via the adminpanel.. it doesn't work and I get this message:

"The theme you are trying to install cannot be found on this server at the specified URL. Please go back and double check that the path to the theme's HTML file is correct. If you uploaded the theme and you are sure the URL is correct please make sure your web host does not have PHP's safe_mode configuration enabled as this can interfere with using or locating themes."

I did check the safe mode, and it is not activated or anything from what I could tell.

could someone please help me. A start(download) to finish(successful upload) step by single step would be very much appreciated.