Hi Praveen,
It's actually on the Support portal. You can reach the support portal via a link on the Service Marketplace or use this link:
Installations and Upgrades | SAP Support Portal
Then click on "Search for Software"
Search for "CTI Connector"
And choose the most recent version for Cloud for Customer
You may need to request access to download--just follow the link/instructions on the screen in that case.
Cheers,
Angela