Just enter your serial and control information. if it is not able to connect to internet then it will ask for lef file for offline processing.
to generate lef file.
just paste generated lef file in that space and you will be licensed.
Let me know, if you need more help.
That is the case with all the Qlikview products. They all need LEF file which they download from the Qlikview server (if interent connectivity is there) and using control number they will verify the LEF.
That is the reason, I have provided the LEF generator form's link. So, LEF can be generated manully.