One note on this for example levels in particular is that starting in 6.6h, plus_install.exe and the autoupdater will no longer include scripting-focused example levels. They have all been relocated to the website where people can download them on a want-to-know basis.

I say "scripting-focused" because plusDOMLevel, plusFRLevel, plusJBLevel, and plusRace1-6 are still included and non-optional. The game needs them to play properly, there needs to be at least one level per gamemode and they're the defaults.