We are trying to use a license that was purcahsed 4 years ago on a new application, (it is working on existing application developed) but when we run the application we get this error:
“The serial key “” is not valid. You are probably using serial key for an older version of the product. Please purchase an updated license to use this product.”
We have the licences for 2.7, using these version of the nuget package: 27.3.30.1253
Can you explain why we are getting this error?