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It's going to take some time to dig through old software boxes for my Diablo Hellfire expansion, has anyone tried this yet?
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I do have hellfire somewhere. I will try this out this weekend (although I first would need to buy my 4th copy of this already mostly DRM free game (al it had was a cd availability check)
1. Original
2. Battle chest
3. D3 collectors edition... (it has a copy on the soulstone usb stick)
I've posted a guide here On how to get Hellfire from CD working on GOG's version.