i couldn't get the 1.8 installer to work either - i was getting "the zip archive in the application is corrupt. please contact the developer for another copy" no matter what. so i went to the faq here and found where i could download version 1.7. 1.7 installer worked great, as does limewire itself. was having way too frequent freezes in 1.4, so 1.7 appears to be the answer to my problems. try that, you may not even care about 1.8!