Ho do I install on mac

Hi, Im interested in filter forge however until such time that there is clear and easy to find information about how to install it I have no desire to part with a couple of hundred bucks to purchase it. I am baffled as to why its virtually impossible to find any instructions about something so basic and necessary for users. I downloaded the trial and put the 2 plugin files into my applications>photoshop>plugins and then I tried with plugins>filters but both times I got a message from photoshop saying "2 or more filters are unavailable for use". Can I even use the trial within photoshop? I really would like to see how they work together before buying it. Can anybody please point me in the right direction. Thanks

Hi yes I have tried the standalone but I want to see how it woorks within PS first before I buy it.

Id also like to know what I use on my imac to magnify as I dont have a mouse wheel?