Try downloading with another browser? Chrome perhaps? In options>under the hood>downloads>put a check in the "ask where to save" box. Download Liggy's files to the folder of your choice. With 7-zip installed, open Windows explorer, go to the file you downloaded, right click on it, bring your cursor down to 7-ZIP, left click the "extract files..." option , click OK in the box that pops up. Your file will be extracted to a new sub-folder with the file name and ready to use.
It really sounds as if your browser is mistakenly trying to open the file you're downloading rather than saving it.