I bought a copy of the LHP-28 CD several years ago, too when it became available, and also have problems with it on newer PCs. As I've discovered, it will only work on older OSs (XP and earlier) and with older versions of Acrobat/Acrobat Reader. I have no idea why, but yes, it is a pain in the ass. If you allow your Acrobat to auto update, you're boned.
I have been able to open and search the directory and skip the homepage on occasion, but that's also a pain, as none of the files have names that make any sense.
I did read somewhere a while ago that there may be a newer version of the LHP-28 CD that has fixed the problem, but I could never confirm before shelling out more dough. I've just kept an older, dog-slow and somewhat unstable PC on hand to use the CD and other car software in the garage.
Maybe someone else can confirm the presence of this newer disk so we can use our MacBooks?