Do not hold your breath for a solution. Here is a snippet of the email sent to me from customer support:
The Message+ Verizon Messages - Windows Desktop application is not compatible with Windows 10 computers. The Windows messaging client for Verizon messages is being temporarily removed to prevent syncing issues and customers should be directed to utilize the messaging web client as a windows alternative by following the steps listed on the my Verizon website- create and send a text: https://www.verizonwireless.com/support/knowledge-base-54302/
The Message+ team is aware is working on a resolution.