https://forum.sa-mp.com/showpost.php?p=4117537&postcount=10
Sorry if this has already been posted elsewhere, took a quick look at the most senseful subforums to post under and didn't see a thread about it.
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So yes, it seems like it is all in open.mp's hands now: Kalcor is not seeing updates other than security updates as a likely thing to happen. SA:MP is "officially" (take that with a grain of salt, as usual) going to be stuck on 0.3.7.