where can I key-in the serial number in LR5?

[棋翔梁16137583]

I have used the LR 5 since 2015

and I have a serial number bought on the official website in Taiwan

But I sometime need to Repeat the serial number in that window.

Now, I can't key-in my Serial number.

How can I fix it ?

[Akash Sharma]

Moving to Downloading, Installing, Setting Up​

[Jeffrey_A_Wright]

棋翔梁16137583, sorry you are facing problems using Lightroom 5.  I am sorry, but I am not familiar with the dialog you have posted.  What is the error message saying?

You can find information on how to locate your registered serial numbers at Find your serial number .