They probably changed the offer or replaced it with some other, affiliate networks do this all the time. Try to ask your AM at mobipium about this, they know about the $1 guide, so they should be able to tell you whether there is a replacement for the offer mentioned in the guide.
Yes what @matuloo said.
I will also ask my Mobipium AM for an update and post it here.
The guide needs some minor updates for sure - apologies for the inconvenience!
Amy