Just if someone is interested, currently battlefield 1942 can be downloaded for free, simply open origin, go to the store, check in the demo’s subsection, and add battlefield 1942. Maybe the have added 1942 to the wrong folder, or they have added the wrong version, since it’s not a demo 
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No mistake, from twitter:
“Johan Andersson @repi
We just released Battlefield 1942 for free, download here for some classic Battlefield fun: http://bit.ly/QijYUN #BF1942”