Why does installation fail?

I right clicked on "Free Download Now" then clicked on "save link as". Then went to that file & right clicked "open as administrator" it took me directly to the Mp3 Rocket downloader & installed fine. MP3 Rocket is the fastest MP3 converter out there love it converts...

The safest way is to re-install the program.

1. Re-download the installation files here:
MP3 Rocket
2. Uninstall the non-working version.
Uninstall or change program Windows Help
3. Install the re-downloaded version.
4. Open My Computer.
5. Locate the MP3Rocket.exe file. Double-clicking on this file should start the installation for the program.

Best solution update your MP3 Rocket program to a newer version. The installation for the latest version of MP3 Rocket will remove any previous versions of the program installed on your computer. You do not need to uninstall the program prior to updating.... Do not click on "Continue" on the MP3 Rocket home page if you want the free version of the software. Clicking on "Continue" brings you to a page to sign up for the Pro version, which can cost you up to $35. To get the free version, click on the word "download" at the bottom of the page.

Are you sure the software is compatible with Windows 8 and 64-bit installations?
You could also check and make sure that you don't have the 32-bit version installed.

Actually MP3 Rocket has no Mac version. I have tried to install it on my Mac OS X Yosemite but failed. I can't run it properly, even couldn't finish the installation. So I turned Any MP3 Downloader for help. It just worked well on my Mac.
http://download.cnet.com/Any-MP3-Downloader/3000-2141_4-76171793.html

Also it has an article which has introduced how to find MP3 Rocket for Mac alternatives: http://www.anymp3downloader.com/mp3-rocket-for-mac-alternatives/

Good luck!

Do you have flash player installed? if you do or dont try http://get.adobe.com/flashplayer/ to download the lastest version, if you already have it, it will tell you, if you dont, it's compleatly free to download and install,
hope this helps, Regards, Josh

Installing Flash Player can be a little tricky. here is the web site to download. You may as well get the player before you try the rocket again;
http://get.adobe.com/flashplayer/
First of all, if you have any prior versions of FLASH PLAYER, reader, etc. is fine, uninstall before you install this. You can uninstall in programs and features. Click on the download then, get out of all apps you're in,ie; Internet Explorer, etc., also make sure you"re not signed in to mail services like "live Messenger or Yahoo that are accessing the web. When you are downloading click next and allow all things that come up to run. If something is interfereing with the download, a window will pop up and list those items. You can minimize and correct then come back, see that item missing from box, and continue. when all is finished, restart system. After restart go to your programs and features and see if Adobe Flash Player 10 is now in your list. Now download your rocket.

Problem solved thank god !!!!!!!!!!!
I downloaded something called combofix from www.Mybleepingcomputer.com to resolve a different issue with my comp ..and guess what afte rrunning this mp3 rocket works again doesnt want me to install adobe all the time

the error refers to a missing mp3rocket.jar file within the installation of mp3 rocket. i.e. C:\program files\mp3 rocket\lib. solution is: uninstall mp3 rocket and uninstall all versions of java and JRE from add and remove programs(XP) then restart. install a new version mp3 rocket and you will be prompted to download java again. once installed MP3 Rocket.exe should be restored

jka1973 is correct. In order to download MP3 Rocket again, just go to their login page and enter your name and email address. Once logged in, go to the top left-hand corner. In tiny print it says, "Install MP3 Rocket". Click on that and then click on the large blue icon in the centre of that page that says, Install Downloading Sofware. You should be good to go! :) Here is the link: http://www.mp3rocket.com/login.php