All plugins disappear

After a power failure most of the installed plugins and extensions disapear and I can’t re-install I only see a download option. Honestly I forgot how to install manually I always was using SketchUcation…
Refresh my memory please…

What version of SketchUp are you using? What operating system? If you want help we need to know these things. Please complete your profile.

Login to our PluginStore and find the SketchUcation toolset.
Download its RBZ - save it into your Downloads folder.
In SketchUp open the Window > Extension Manager > dialog…
Click the bottom-left red-button ‘Install Extension’.
In the dialog that opens navigate to the RBZ and select it and Open.
SketchUp then extracts the toolset into your Plugins folder - it appears in your Extensions menu.
You can also open its Toolbar…

Now you can use the first red-button on the Toolbar to open the ExtensionStore³ dialog… and Auto-install any of the items listed.
Remember that some authors, like thomthom and Fredo, require that you also install their ‘Lib’ which contains shared code - restart SketchUp after first installing any Lib RBZs so that everything gets synced…

Sorry I though my profile was already complete

Thank you TIG