For any future people with same problem - here's a simple way to work around it (which I use) - simply instead of using your own phone number use one of those "receive sms online" services. They change numbers every 3 months and once they does it, the old number will become unusable.
I personally do this for security concerns and it works.
Yeah, this is what I do.Honestly, to me, using the newest releases for work just sounds like madness.
Just find a good release, save .exe file, and use it until they cancel compatibility
(as happened to my 6.5.4.4720 )
Rinse and repeat ¯\_(ツ)_/¯