Same problem here. Message+ doesn't work with windows 10.
In addition, THEY DON"T OFFER A WINDOWS 10 VERSION ON THEIR SITE at https://www.vzmessages.com/introduction/index.html
On top of that, the web based app is a piece of junk. I have MISSED CRITICAL COMMUNICATIONS because it timed out and didn't send the message.
THIS IS A DISGRACE. Verizon is in the business of communications and they can't figure out a simple app that will work with Windows 10.
If you log in to https://www.verizonwireless.com/my-verizon/ and select Account from the drop-down on the upper right there will be a Text Online option which gives you the Win10 download link. VZW Support on this forum has been stating that the Win10 app is being removed and maybe they're referring to that link you were trying to get it from.
cgmendla, 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. The Message+ team is aware and working on a resolution.
After you click on download client Windows 10 you get directed to the Microsoft Store and there a message is displayed "Verizon Messages is currently not available."