My client has purchased SAC license. so i believe they will be getting AFO license for Sap Analytics Cloud edition.
Could someone tell how will i install that.
I think you ask a quite generic and broad question. There are a lot of blogs out there which you should be looking into:
Also training-wise you'll find hopefully a starting point by searching in learning hub:
Important help portal links:
SAP S/4HANA Cloud Financials Development
You can download the AFO for SAC from SAP Software Download portal. You can go to Support.sap.com and sign in using your S user id. Please note you would need download authorization on your S user.