The pack file has corruption that can be fixed by running reclamation

For the time being, the only option is to delete Content.ggpk and redownload it by running the client. This is a known issue that we are working towards a fix for! Sorry for the inconvenience.

Moved thread to Beta Bug Reports forum.

Have you tried running pack check? http://www.pathofexile.com/forum/view-thread/18531

Also as others have said it's a good idea to back up the Content.ggpk file just in case (although we are working towards making this unnecessary).

The game can't actually cause shutdowns, but the game overheating some part of your PC can - Turn VSync on if you don't have it on, or install a framerate limiter? Let me know if your PC temperature remains low but this still happens!

Yeah, if the game asks you to run reclamation, your only choice is to download the content.ggpk file again. I suggest backing it up so you don't have to do this!

"

Gava25 wrote:

Could someone explain how to find and download the "content.ggpk" file again please?

You'll find it in your Path of Exile folder, which is usually in C:/Program Files(84x)/Grinding Gear Games/Path of Exile. You can delete or move the old content.ggpk file, and then running the game will repatch the whole content.ggpk file.