There may be other unforeseen breakage primarily in the handbook portion of the wiki.
The Table Of Contents section of each "PC-BSD® Users Handbook" page may be the best workaround.
Legacy PBI Access
Users searching for PBIs for legacy versions of PC-BSD may find them archived at the locations below. Users still running a legacy copy of PC-BSD are highly encouraged to update to a more recent version, as the archived applications may be out of date and have known issues.
PC-BSD 1.x - 32bit - No longer available