>I am just tried w/ SP1 & there is no problem. But how to upgrade (SP1 is 16MB) every client. They are in the whole country with "amazing" internet, some dosn't even have CD-ROM, etc. :o((

How did your users install your application initially? Can't you use the same media?

Also, you only need to distribute the run-time files (VFP8R.DLL, VFP8???.DLL - resource file). Zipped up, I don't think they are 16MB.