Yes, in Denodo Platform it is possible to connect higher versions of Subversion as long as you have installed a Subversion Client 1.7 in your machine.
For example, I have used a Subversion Client 1.7 and connected through the Virtual DataPort Server to a Subversion Server 1.10 without any issues.
You can refer to the section [Virtual DataPort Server Configuration
](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/version_control_systems_integration/vcs_configuration/virtual_dataport_server_configuration) of Virtual DataPort Administration Guide for more information.
Hope this helps!