You don't have to reinstall every time if you want to alternate between old and new tracking. Copy the V1 installation to another folder, let's say C:\Program Files (x86)\Leap Motion V1, then install the skeletal beta.
When you want to run V1, shut down the service via services.msc, navigate to C:\Program Files (x86)\Leap Motion V1\Core Services in a command prompt, and run LeapSvc.exe --run
When you want to switch back to V2, use Ctrl+C to kill the V1 service and restart the Leap Service in services.msc.
We hope not to support this flow--and it should be unnecessary once V2 is wholly superior--but it's there if you need it for development.