I have installed it on one of the oldest machines it supports, a Mid 2007 20" iMac. It's an upgraded base model, it has a 2.0GHz Core 2 Duo, 4GB RAM, and a 120GB SSD. Along with the ATI Radeon 2400XT with 128MB VRAM.
And it runs just fine! Minus the bugs. From a usability standpoint, every machine it supports should be fine. Some will need more RAM, sure, this shipped with 1GB, then went to 2GB, now to 4GB. And moving from the original 7 year old 250GB spinner to the SSD has made a massive improvement. The bottleneck know is the old ATI card and the 2.0 Core 2.
Your 2008 should run similarly, and the MBP may be a little better. When it releases or even now, if you aren't satisfied with it's performance, look into a RAM and SSD upgrade. Should last a few more years.
As for obtaining a copy without being a developer, it can be done. But that's all I'll say. It isn't a legal copy either. So we can't help you on that here. Rules are rules
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