You can see your serial number on the machine where it is already activated from the below location.
For Mac: Serial number /Users/[user name]/Library/Application Support/Adobe/Lightroom/Lightroom 6.0 Registration
For Windows: C:\ProgramData\Adobe\Lightroom\Lightroom 6.0 Registration.lrreg file.
If that does not help please provide your redemption code via private message and i will email you the serial number on your registered email address.
My Redemption Code is REMOVED
[NEVER POST A REDEMPTION NUMBER IN AN OPEN FORUM !!!]
[personal information removed... Mod - https://forums.adobe.com/docs/DOC-3731]
[This is an open forum, not Adobe support, please do not post personal information]
[You have just given your redemption number to everyone who read this message before]
[I deleted the number... or people who receive all their forum messages via email]
Thanks so much for all your help!!
You were asked to provide information by PRIVATE MESSAGE, not in a public forum
Hover your mouse over Gautam's avatar and then click the MESSAGE option
Do be aware that you will now need to ask for a new redemption code
Could you please confirm if you were able to activate Lightroom with the serial no. provided to you via private message?
Yes, I was able to activate Lightroom! Thank you so much for all your help, you were great!