If you want to play bundle, always install game in that order :
2--> Silverfall earth awekening (SEA)
Never try to install SEA 1st because SEA is false standalone : it use files data shared for both original & standalone extension (like PhysX drivers). If Silverfall is already installed, SEA will only download few files to complete bundle.
I don't believe i play this game today. Gameplay isn't good but i play with fun because i know how to level up to grow in power. This game isn't so bad that people said about it.
Perhaps there is a way to play multiplayer without Hamachi. I tried to register @ official link in-game but server down since many years i think. Companions help for heal & support you. But i prefer human players.
Worth the money : i recommend full bundle.