In regards to updating your Vijeo Designer V6.2 to the latest service pack, here is a description of what each file does:

(Required updates)
This is for your buildtime environment. ie. Your PC where you develop projects. Install this first.
https://www.seupdate.schneider-electric.com/download/HMI/VijeoDesigner/Vijeo_Designer_6.2_SP12.exe

(Optional updates)
Updates Manuals and Help menus. Install this second on the PC where you develop projects.
https://www.seupdate.schneider-electric.com/download/HMI/VijeoDesigner/Vijeo_Designer_6.2_SP12_Docs_Package.exe

Used on iPCs / PCs that are used as HMIs (ie. not the development environment)
https://www.seupdate.schneider-electric.com/download/HMI/VijeoDesigner/Vijeo_Designer_6.2_SP12_Runtime_for_Windows.exe

Used on PCs where you need to connect to your HMI remotely via Web Gate
https://www.seupdate.schneider-electric.com/download/HMI/VijeoDesigner/Web_Gate_Client_Files_6.2_SP12.exe

Release Notes
https://www.seupdate.schneider-electric.com/download/HMI/VijeoDesigner/Vijeo_Designer_6.2_SP12_Release_Notes/Vijeo_Designer_6.2_SP12_Release_Notes.htm

Released for:Schneider Electric Nigeria