You probably using trial version and you must purchase a key to activate your product..
if you don't want to spend dollars, then i suggest the alternative way is try other video converter
that does not require activation even free or trial..
try with this link>http://www.filesonic.com/file/125454271/Altysoft-Free-Video-Converter.exe
click or copy and paste to your browser.
goodluck
Do u know anything about error caused
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