Very simple to upgrade for for Ascent servers (not sure about the others)!
1. Open your directory to C:\AC Web Ultimate Repack\Ascent\logonsever.conf
2. Scroll down to the area <client minbuild = "XXXXX" maxbuild = "ZZZZZ">
3. Type 8300 in place of the "Z"s
4. press control + s ....or save the file
5. enjoy....your done!
EDIT:
OR just look at the pretty pic