Guild Wars 2

This has happened a couple times since the LW3 Ep6 update, not sure if its related

First it happened with a client crash and when i tried to reload my GW2 i got the Message stated in the Topic Title. I went into my game folder and it showed up as 0 bytes and i noticed two new files a .000 and .001 file type.

After trying to just run a reinstall repair, I still had the problem so I just deleted the game and reinstalled to new location.
This worked but is very time consuming.
But now again the problem occured, my GW2-64.exe is not a valid windows application.

I dont know if anyone else has encountered this or if this is a known issue. I didn’t think I saw anyone else post something similar in the forums

I kind of think having the full package deal is a little bit unfair to people who have been playing since day one. I pre-ordered GW2 collectors edition (for physical I had to go through a third party ie Gamestop) because I loved Guild Wars and wanted to continue supporting. As HoT is not a stand-alone game, I don’t know if its fair to shut out those who were “unfortunate” to have bought the game ages ago, been the first ones out there playing through, and now are forced to pay more for a second copy of the game just to get the expansion.
Given that the majority of players already have the game, why is it not an option to just purchase the expansion especially if we already have the core game?