Just downloaded the new versions and theres issues help

[blaze7736]

okay not sure how this section works so here it goes downloaded the zip file and draged the files across like i always do for a new update and i am getting these errors whats wrong and how can i fix it

[Coenmcj]

uh.. Looks like the files might not of downloaded correctly, Looks like some of the ThingDef's are missing. Try redownloading?

[Matthiasagreen]

I will say this on the off chance this is why it is happening: worlds and games created before Alpha 10 are not compatible with Alpah 10. Make sure you are starting a new world and a new game.

[Tynan]

You have to delete all the old files from the old version. You can't install the new one on top of the old one.

Delete the files and reinstall clean.