How to Install DAZ Studio 4 (4.5.1.56) Windows
https://helpdaz.zendesk.com/entries/21391331-how-to-download-and-install-daz-studio-4-windows
How to Install DAZ Studio 4 (4.5.1.56) Mac
https://helpdaz.zendesk.com/entries/21429218-how-to-download-and-install-daz-studio-4-mac
ADDITIONAL ARTICLES
How to Install Content into DAZ Studio 4
https://helpdaz.zendesk.com/entries/20659227-content-configuration-in-daz-studio-4
3D Bridge
https://helpdaz.zendesk.com/entries/21045731-how-to-install-and-use-3d-bridge-in-daz-studio-4-pro
How to Remove DAZ Studio 4 and the CMS (PC)
https://helpdaz.zendesk.com/entries/20779763-how-to-remove-daz-studio-4-and-cms-pc
Also see the FAQ article:
http://www.daz3d.com/i/faq/0?id=360&_m=d