latest release is revision 1268 (the green button on sourceforge).
don't use the installer (I think it gets latest "release" not latest revision), just get the zip and extract to your SD.
latest release is 3.0 revision 1180
latest revision is 3.0 revision 1268
full channel = contains the USBLoaderGX program. you need to reinstall a new channel for each new release of the program (and a new release of the full channel to update the program which is inside). There's no new release of the full channel since revision 1180 3.0c.
forwarder channel : contains a small program to load the "boot.dol" on SD card. it "forwards" to the dol on SD. the advantage is that you never need to update the channel or reinstall it. It will always loads the "boot.dol" on SD card, whatever the version. it's easier to update : replace the dol on SD.
the forwarder channel is here :
https://sourceforge.net/projects/us...er GX-UNEO_Forwarder_5_1_AHBPROT.wad/download
install it using a WAD manager.
you won't need to update or replace it (unless I release a new forwarder one day, but then I'll tell it to everyone, or I'll update the version to 6.0).
if you are sure you already have the forwarder, then you don't need to reinstall it.
if you launch the loader from the channel, and you don't have "3.0c" in the credit page, then you don't have the forwarder, and it should tell you "3.0 r1268".
to update the loader :
download the latest revision (green button) on sourceforge, or try the internal option "update the loader".
but I sometime forget to trigger the update using the internal option, so you better check the site, or my signature to get latest beta.