That document is for ConfigMgr/SCCM Current Branch and not the version of ConfigMgr that you are running.
Do you want to update the console or the site?
I'm assuming you mean the site. If so, then you can perform an in-place upgrade to ConfigMgr CB using the media from Microsoft (assuming that you are licensed for it).
Alternatively, you can upgrade to ConfigMgr 2012 R2 SP1 CU5 (which is still an old version but is newer than what you have) using the freely available downloads from Microsoft.
Jason | https://home.configmgrftw.com | @jasonsandys