The Cloud Connector is an optional on-premise component that is needed to integrate on-demand applications with customer backend services and is the counterpart of SAP Connectivity service.
For more information, see the Cloud Connector documentation.
Please check SAP note 3302250 for details about the support strategy of Cloud Connector.
Exceptionally, the installers for the previous feature release 2.16 remain available for download, as 2.17 allows an upgrade starting from 2.13 only. The same is the case for applying backups. Thus you can still upgrade your no longer supported installation of Cloud Connector for very outdated releases. It is strongly recommended to plan upgrades of such versions as soon as possible, as the 2.16 installers will be withdrawn at the latest once the next feature release of Cloud Connector will be published.
Note: The Portable archives for Cloud Connector are meant for non-productive scenarios only. They can be used even if you don't have administrator permissions on the machine, on which you like to use the Cloud Connector. However, those variants do not support upgrades from previous versions.