activation on new computer

[Dinesh Moghariya]

I have lifetime Nitro Pro 12.12.1.522. I got new computer and trying to activate it not new computer. When I generate ticket, it takes me to activation page to find license by entering serial number. When I enter serial number, it  pops up window suggesting please enter valid cereal number.  When I generate ticket with my name, email and same serial number then it takes me two second page to find a license. It is only second page where it is not helping me to find my license. Pl help.  

[Leslie V]

Hello Dinesh,

Thanks for contacting Nitro!

Unfortunately I was not able to find your account records.

If you purchased Nitro Pro from our website, please provide us with the following information so we can look up your account.

1. First and last name of purchaser 
2. Email address used purchase Nitro
3. Order reference number

Looking forward to hearing back from you.