Short of it is: Whenever there is a Reflect 9, it will have paid versions only. 8 Free will get patches until Jan 2024, but won't officially support any future versions or build upgrades of Windows.
Note: Release v8.1.7280 was available for a short period of time. These release notes cover both v8.1.7280 and v8.1.7336. Macrium Reflect v8.1 is here We're pleased to announce the public release of ...
I figure that Macrium's last freeware distribution will still work for most HD/SSD cloning, for now, but I wondered if a spiritual successor had arisen yet? Hard to believe that it's been 2 years.