Umm, if you start it, it should ask you if you want to enter a key or use the 30 day trial, select the trial and click next. If nothing ever comes up when you open it, I would suggest re-downloading and re-installing.
What the fudge is e7 file? Anyways, if you have the install .exe it should just install and you are done. Go to program files > Adobe > Adobe Flash(or a path similar to this) then use the .exe in there to start. If that doesn't work then you need to redownload or reinstall.
7z is a compress file, you need a program like winzip/winrar/alzip to extract it if you haven't done so. And could you just show me a link to a screenshot of where you are at, like where you don't know where to go from?