fedora 15 ? might ? have a problem with the old hardware .
now i have a old box with a HP 960c(parallel port) and fedora 11 32 bit was the last version of fedora i ran on it
currently I have ScientificLinux 6.1 32 bit running on it and the HP printer is auto setup
but in 15 a lot of things did change ? so ....
the specs on these three old computers would help .That way we can point you to a OS best suited for the hardware .
It looks from your first post that fedora15 did install, so you MUST have at least 1 gig of ram ( 640 min) .
with fedora ( and ,red hat ,cent ,and Scientificlinux)
you normally do not grab software off some web site .You use "yum" and the fedora software repos to install the programs
all the hp cups drivers are in the base fedora repo
and should have been installed at the time of the OS install - that is the default behavior of the installer
so for the printer
that should return all the hp related cups you are looking "hpijs "
however that IS part of hplip( installed by default )
so if hplip IS installed then it just needs configuring
the easiest way is the web interface
click on the link below - it WILL be YOUR computer
and set it up