Actually, I seem to have gotten that confused with the amiga developer cd. GAAH! This is offtopic, but I noticed that natami has a copy of the rkm manuals. Is that legal? I always wanted a digital version, but I don't want to steal it. I know other sites have it, but I always thought they pirated it.
I would look at returning even with a 20% restocking fee and shipping costs. What you have is completely useless. The developer CD is still good but a little old. I wouldn't worry too much about downloading the manuals. No one is losing money over it. There are plenty of versions elsewhere on the web including some in amigaguide format which is generally easier if programming on an Amiga. There is no need to pay for a C compiler either. VBCC is free and available here...
http://sun.hasenbraten.de/vbcc/VBCC = easy to install, supported, cross platform (including Amiga flavors), free
GCC = difficult to install, not supported (on Amiga), cross platform, free
SAS/C = average to install, not supported, not cross platform, not free
Any other C compiler for the Amiga is not worth considering IMHO.
