Hi Linsook
I asked a similar question a long time age when I upgraded to Windows 10. The Blackvue reply is as follows:
Latest from Pittasoft:
Hello John,
Sorry , my bad.
Unfortunately, we used to have BlackVue app on windows store, but we do not support it anymore.
My apologies for the miscommunication and the trouble it may have caused.
Best Regards
Taqi
BlackVue Support Team
Seems to be pretty clear - Android, IOS or Cloud, or revert back to Windows 7/8.
I don't know if this will work with the 650s, but I hope it helps.