unable to upgrade to latest new version of nitro pdf

[goldpan]

Hi everyone. I have a very old version of nitro pdf that ran on my old laptop with a microsoft windows vista operating system. The old version of Nitro pdf is 5.3. I am the original owner and I do have the original CD desk with the serial number. I put in the serial number to upgrade but got a message that said something like " go to the forum for help. " But after reading some of the help topics and answer I did not see or read anything that would help me. I have a brand new laptop computers that has a windows 10 operating system.  How can i upgrade to the latest version of Nitro pdf without paying the new customer retail price.   Your help with this issue would be greatly appreciated.  Thanks 

[Mario Kevesic]

@goldpan Unfortunately, there is no way to upgrade to version 11 without paying the new customer retail price. If you check our upgrade page, https://www.gonitro.com/pro/upgrade, Nitro Pro 8 or older versions users pay full price.