Hey, I just recently got a new laptop and wanted to install my sonar LE on it, unfortunately I apparently lost the disc (I will keep looking) but I was wondering if there was anyway to get just download it, if all else fails.  I don't have the Serial number, as it was on the paper with the disc.  I have it installed on my main computer still, waiting to delete it, is there anyway I can get my serial number off of there?  Thanks for any help I receive..I really don't want to have to go out and buy a new one ha.

Welcome to the forum.
I don't think any version of LE was available as a download; it usually came with a piece of hardware.
If you registered your product, you can find those numbers by logging into your account at the Cakewalk store website and look under 'My Registrations', but you'll still need the disk.

The serial number is also available by clicking Help>About Sonar in your installed version. But, as Greg noted, it's not much use without the disc. And you don't have to delete it from your main computer to use it on a second.
For what it's worth, as a registered user, you can download X3 for $49. It's way better than LE, and it actually includes some usable plugins.
The license even allows you to install it on both computers of you choose to do so.

I have sonar x3 i lost the disk how can i get it back or download

The installers may already be in your account. If they are not there contact account support.

jean-simon2008
I have sonar x3 i lost the disk how can i get it back or download

I supposed it is possible to have disks but none of mine have disks from 8.5 onward. Cakewalk would have all your information and you can get to it via your account. 
 
Log in and check it out. 

Avast me harties.....