Find the full version here:
OPN 2.4.3

openphpnuke-2.4.3-full.* - The whole OPN, with modules and all languages included
openphpnuke-2.4.3-core.* - OPN without the modules
openphpnuke-2.4.3-modules-full.* - Only the modules complete
openphpnuke-2.4.3-module-xxx.* - single modules(only these who have changed since 2.2.5 )

There are also update files to update older OPN versions to 2.4.3 here
If you are not sure, install 2.4.0 over your old OPN and do a sequentially update to 2.4.1 and 2.4.2 and them 2.4.3


We recommend to use the *.tgz or *.tar.bz2 files.
These are much smaller than Zip's. Windows can use theses files without trouble:
*.tgz can be handled with Powerarchiver, Winzip or Winrar.
Powerarchiver or Winrar can handle *.tar.bz2 . A pure " tar for Windows" is available as gnuwin32.

The OPN-Team