The 5 series features some major changes over the 4 series: in short, an interactive development environment, and significantly faster compilation for large programs. 5.04.3 is the latest stable member of this series.
This installer relies on the Windows Installer runtime to operate. If, after having downloaded the above file, double-clicking on the MSI file doesn't start up the installer, the likely cause is that you don't have the Windows Installer runtime installed on your machine. You can download it from Microsoft:
Install the appropriate version, then double-click again on the MSI file.
FreeBSD users can install a binary package of ghc by saying
To install from source instead, make sure your copy of /usr/ports is up to date, and say cd /usr/ports/lang/ghc && make install.
The OpenBSD/x86 packages should work with any post-3.0 installation of OpenBSD (they were built on a 3.3-beta system) and were prepared by Don Stewart.
MacOS X 10.2 (Jaguar)
It's a double-clickable disk image containing an Apple Installer Package (.pkg). It includes profiling & GHCi, but no documentation (use the online docs for now). GHCi is now statically linked with Readline, but the readline library itself is not included, so you will have to install that seperately if you link anything with -package util.
MacOS X packages were prepared by Wolfgang Thaller.
This is an unregisterised build, currently without GHCi support.
PowerPC/Linux support is by Sven Moritz Hallberg.