Downgrade to Plus

Please send me the link to downgrade to previous windows version. Since upgrading to your current version I have lost contact to the Oppo 105 player. The whole purpose of this software is lost to me without the ability to communicate with my device.
I find it incredibly irritating that you do not have simple links to previous version for logged in licensed users.
My request on a previous support chain where other users are having the same problem remains unanswered.