I downloaded and installed properly the new version in its folder ,
I start the Launcher , and then whatever my graphics settings are,
when I click "launch", it crashes with a "Memory Violation Error"... :(

sorry for double-post :
...and I am on Windows Vista, by the way.

No, forget it, it works now.
...
it didn't work because I put its folder in a sub-folder of the Desktop.

Mod edit: Keep thoughts consistent in one simple most. If you need to, just edit your post and have a moderator or admin bump up your thread.

You can edit your first post if you need to add content. Try running the game as an administrator, right click the game's .exe file and click "Run as administrator" That should do it, if that doesn't work come back.

Wait, then where did you put it after you found out the desktop was the problem?