May I suggest adding the vote links from main site somewhere inside the launcher application?
In opinion it would stimulate (and cut the necessary actions to vote in half) people to vote. I say cut in half because currently in order to vote you have to open the main page and find the links - yes they are big and very visible, but having another extra step, myself honestly as I log my chars I forget that I had the intention to vote in the first place.
Having them as shortcuts in the launcher itself will be much easier.
Desired flow:
1. Start the Launcher
2. click vote button
3. the vote page opens in the background
4. click start the game
(or in case of numbering buttons: 1.Create an Account 2.Vote(with small icons for each site) 3.Full check 4.Start the game)
Example below (or something in those lines):
