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Installing or updating ElvUI works like every other AddOn.
1) Download the AddOn (Retail / Classic) 2) Right-click and extract it. 3) Then move the folder(s) to:
• Retail: World of Warcraft / _retail_ / Interface / AddOns
• Classic: World of Warcraft / _classic_ / Interface / AddOns
We recommend that you delete the old AddOn folders first, to prevent lingering files causing issues.
• ElvUI and ElvUI_OptionsUI
Updating AddOns will not cause settings to be lost, as all settings are stored in the WTF folder.
 ElvUI is only ElvUI and ElvUI_OptionsUI(loadable on demand) in your ingame AddOn list.
Every other AddOn starting with ElvUI_XXXX is made by the community and could be outdated if the author is inactive.
 ElvUI is not a "collection" of multiple AddOns, like some people believe.
If you want to use external AddOns for specific features like Chat, ActionBars, NamePlates - you have to disable the ElvUI module for this feature first.