i have been having trouble with this. i have the serial number too. i need it on my new pc and off of my old one. its hard because they already made 12 so i cant get the trial to activation for 11. i didnt buy it with disc version. i have the online version that i bought on amazon
Didn't you save the downloaded file?
The Elements Tutorial Links Page http://forums.adobe.com/thread/1275830 may also help
-has links to the FAQ/TIPS pages AND download versions 7-thru-12
This time, write your download file (and a text file with your serial number) to a DVD as a backup
You also need to make a full copy of your boot/software drive to a USB hard drive
The product I use is at http://www.terabyteunlimited.com/image-for-linux.htm
Image runs off of a bootable CD via Linux (the Zip you download includes a program to make the bootable CD) and it reads EVERYTHING on the drive, even the hidden registration information, so everything is restored when needed... and you may restore the image to a brand new drive in case of a crash, and not have to re-install anything