I've downloaded avgas-setup-18.104.22.168.exe several times and I'm having difficulty opening it. I've downloaded it with ie7, firefox and wget. I've downloaded it to 2 different computers and to a network drive. After each download, when I try to launch it, I get some variation of an "access denied" message. Often I get "Windows cannot access the specified device, path of file. You may not have the appropriate permissions to access the item". The permissions on the file seem fine. The size of the file is 6,469,352 bytes. I can't compute and md5 checksum because the md5 utility can't open it.