Ok so this is coming from ovftool.
The version on Studio is a bit old. You might want to try the latest version which I believe has had some curl related changes.
https://my.vmware.com/group/vmware/get-download?downloadGroup=OVF-TOOL-3-0-1
You download the VMware-ovftool-3.0.1-801290-lin.i386.bundle from the options on that page
I just tried to install it on a 2.6 build and it was fine, that however will leave you with two versions, this version will get installed in /usr/bin while the default version shipped and used by studio is stored in /opt/vmware/share/ovftool as you can see.
You can take that command that was run and use the /usr/bin/ovftool instead.
*edit*
One more thing, that file you download will want to append a .txt to it. It's actually a shell script that wraps the binary as an installer. So chmod +x and run it for the install.