Process to track the software version that the customer has

Hello,

I work for a Hitech industry.

We have a software product that customers download through web.

We want to keep track of what software version the customer has and contact them accordingly to provide upgrade to the customers software.

Does anyone worked in such process, what is the best way to track the Material( Product) version ?

I'm sure there should be some standard process that SAP recommends. Appreciate any info on this.

Aj