Recently bought BOSS ME 25, but, unfortunately didn't get the disc of Sonar LE with it. So my question is, can I redeem my given activation code of Sonar LE by downloading a trial version from the site? Do I need to download any specific version if I have to redeem the given activation code with BOSS ME 25?  

Did you buy the boss me 25 brand new ?
it should have come with a DVD:
"The Boss ME 25 includes A DVD of Cakewalk Sonar 8 LE and over one hundred audio loops"
 
I believe you will have to use Sonar 8 LE to use the code to authorize it.
but they may honor the newer sonar LE versions if you ask support.

Hi, and welcome to this forum. I believe that you need to create an account at cakewalk.com. 
Enter your code here: https://www.cakewalk.com/Redeem
You should then be able to see / download your product after that I think.
All the best. 
 

Zargg71
Hi, and welcome to this forum. I believe that you need to create an account at cakewalk.com. 
Enter your code here: https://www.cakewalk.com/Redeem
You should then be able to see / download your product after that I think.
All the best. 
 

Ken is correct. I don't know why I didn't think of that.
you should get a better idea once you redeem your code.
let us know how it works out. 
 
you can always do a trial of platinum as well. I think you will find that superior to Sonar LE.