Can no longer open Nitro Pro

[Joseph Roccanova]

My computer somehow updated to Windows 11 on its own.  I reverted it back to Windows 10, but cannot open Nitro any longer.  I tried activating through your support menu using my Nitro 13 serial number, but could only activate a 30-day trial.  Please help reactivate my program.

[Reymund Oyong]

Greetings @Joseph Roccanova

Thank you for reaching out through our Community Forums!

Please try activating the software by launching it and then navigating to the Help tab > About Nitro Pro then click Activate, enter your version 13 serial number then click Activate. 
If you encountered an error, please provide the following:

1. The exact error message after attempting to activate.
2. The version and complete build of your Nitro PDF Pro. The details can be found in the application under the Help tab > About Nitro Pro.

Kind regards, 

[Joseph Roccanova]

1. The message I get when I enter my 18 digit serial number is:  "The serial number entered does not exist"

2. My Nitro 13 Serial Number is:  504*************70.  It was purchased on December **, 20** under your Invoice Number BKD-73*******26, Your reference number:  30*****39, for $195.51.  When I go to the Help tab > About Nitro Pro as you suggest, it shows the trial version Nitro PDF Pro 14.19.1.29 

 

Edited February 20 by Reymund Oyong
Hide Serial Number and reference numbers.

[Joseph Roccanova]

... I also tried downloading the Nitro 13 installer from the link:  
https://www.gonitro.com/product-details/downloads - click the 'Download Nitro Pro 13' link, as you suggest in other chats, but it would not install because a newer version of Nitro (the trial version 14) is already installed.  I tried uninstalling that version, but I get a failure mewsage that "Nitro PDF Pro Setup Wizard has failed"  

[Joseph Roccanova]

FYI - I was finally able to resolve the problem by deleting the trial version and then reactivating Nitro Pro 13 using my serial number.