This guide is provided for reference purposes only. All installations and upgrades (other than for cumulative updates of the same GroupShare version) should be performed by SDL Professional Services or an SDL Authorised Reseller. Please contact your sales representative or reseller to arrange this.

Troubleshooting failed self-installations is not covered by the support contract and is performed entirely at your own risk.

The guide is frequently updated and you can find it in your SDL account on oos.sdl.com under Product and Plans -> Downloads, right next to the GroupShare installer download.
 
The direct link is this one for the Installation Guide:

https://sdl.ssl.cdn.sdlmedia.com/636903912226112297AH.pdf

And this one for the Release Notes:

https://sdl.ssl.cdn.sdlmedia.com/636715544646801815YM.pdf