Time to come to terms with halted development of the game. This happens to hobby projects everywhere and Prime is neither the first nor last to experience such thing. The source was since long available but lacking a proper license, people are having doubts whether it is a good idea to make a variant or try taking it further. It has not stopped me or Psiweapon since we got on Cyrus' unofficial permission pretty fine but it is a real problem.
To address that from now on version 2.5 is released under Aladdin Free Public License. Visit http://prime-rogue.net/
for download or use this link
. This is a source code only release. 2.5 does not differ significantly from 2.4a in non-technical aspects.
A somewhat frequently asked question might be why Aladdin license instead of something more common like GPL or more free like MIT. Trick is we do not possess the rights to sell PRIME and consequently cannot grant it to anyone. Free software licenses and many open source licenses typically make that allowance thus we cannot choose them. If you really, really want to sell the game or slap GPL on it you need to obtain the permission for commercial usage from the only person who has this right to PRIME sources - Cyrus Dolph, author of ZapM