Hmm, I'm not sure a disc will help. Regarding the 7-zip message: Your computer may have a policy set that bans self-extracting archives; this is most common on systems managed by large corporations. The following workaround was posted earlier this year. ''This workaround uses WinZip. If you do not already have WinZip, you can download a trial version from [http://www.winzip.com/index.html]. (It might work with other programs, but I haven't seen the instructions for those.)'' (1) Download the "full" or "offline" installer from the following page (scroll down to your preferred language) to a convenient location: https://www.mozilla.org/firefox/all/ Note: for maximum plugin compatibility, choose the regular Windows release, not the 64-bit release. (2) Start WinZip, then open the Firefox Setup 47.0.1.exe file. WinZip should display a folder named core and a file named setup.exe (3) Select the setup.exe file and click the "Unzip and Try" button. According to the earlier post, this bypasses the policy problem. See: https://support.mozilla.org/questions/1088420#answer-793218