problem with the install

I made a program which installs many file then I contracted it in Izma. Then I puts it on my ftp and downloads it on my other computer. But when I want to install it, there is a problem which says:

"The installer you are trying to use is corrupted or incomplete. This could be the result of a domaged disk, a failed download or a virus..."

What is the problem?

If it works on your computer then something went wrong during the transfter. Check your connection and your FTP software. Try disabling multithreaded downloading if it's enabled.