Hi,

Is it possible that i can update my Fedora core4 to Fedora Core6 or 7?? Would it be free or cost money???

Fedora is free. Just download the disk(dvd) and burn them.

Even when upgrading from version X to Version X+1 it is STRONGLY recommended to do a fresh install. When upgrading across multiple versions it is almost required. Yes, some can get away with just upgrading without a problem, but when trouble does show up it is very difficult to diagnose. Save yourself the headaches, back up your required files and do a fresh install.

Support for FC6 will be dropped when F8 is released (September?).

Which is the most updated/available version of Fedora Core i.e. 6 or 7????

A software upgrade is more probably successful if you haven't installed any non-official packages. It's possible, but you'll have to do it FC4 -> FC5, then FC5 -> FC6, then FC6 -> F7, if it works. It might be it doesn't. A lot easier (and faster) way is to download Fedora 7 iso images, burn them to discs and do a fresh install, overwriting the existing one (preferrably formatting every partition to make sure no traces of the old leave). Backing up should be fairly easy, depending how much you've tweaked the system and what you want to spare; if you're ok with not saving system-wide settings, just want your personal data and personal settings, copy your home directory to a safe place, and after the install drop it back in.

If you upgraded 4->5 then 5->6 then 6->7, you would be downloading almost three times as much data than if you just downloaded F7 iso files. Unless you have 10M or faster connection, I'm pretty sure you don't want to take that way.

EDIT: the newest one at the moment is Fedora 7 (note naming: they were Fedora Cores up to and including 6, but from now on, they're just Fedoras). Another reason why you should download the isos and do the install that way is that once you've burned the discs successfully, network won't be a problem during the installation. Should your network connection fail during a software upgrade using yum (or equivalent), you had severe problems in a bad case. And you would have to do it three times, so the probability of getting a network error which would trash the upgrade process is big. Save time, bandwith and your nerves and download the discs.

Thanks for your advice!!

There is an added problem when going from FCX to F7. In the past pata drives have been labeled hdX and sata as sdX, in F7 all drives are labled sdX. When upgrading this can cause a problem with proper drive identifications. If you are all sata there will be no issue. If you are mixed or all pata, things can get pretty ugly.

This is only an issue with upgrading not a fresh install.

Lazlow i agree!