Can't upload license into Microsoft Dynamics Nav flf file

I am trying to update my development area with our new developers license but the upload button is greyed out.
how do i switch this on?

system is Microsoft Development Nav 2016
Chris MichalczukConsultantAsked:
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Chris MichalczukConnect With a Mentor ConsultantAuthor Commented:
sorted by selecting Change then go to file and save and then the upload button appeared!
Chris MichalczukConsultantAuthor Commented:
sorted this
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