I don't think the PJ64 website has warez? Does it? If not then your pretty safe for asking a link to its site.. Official version? The version that every other emu site has is the OFFICIAL version.. Just download it from them.. Here is a site that has it..
www.ngemu.com But if you just gotta download the same thing from PJ64 site then here..
http://pj64.emulation64.com/iedefault.htm
Funny but the link was also in the N64 section of, you guessed it, ngemu.com..
For Mario 64.. NOthing beats corn.. Unless you got a super fast comp and all n64 emus run full speed.. then.. Hey all N64 emus do run full speed on my comp.. But I still prefer playing Mario 64 on CORN.. The pluggin features of the newer N64 emus are getting sweet though.. Rumble pad..