Going forward, the minimum officially supported OS version for Community Applications is 6.8.3. Any issues with CA running on 6.4.0 -> 6.7.3 will not be fixed. Issues with unRaid versions 6.8.0 -> 6.8.2 may or may not be fixed depending upon the complexity.
The only issues I possibly foresee with 6.8.0 -> 6.8.2 would be minor display aberrations.
The minimum version for CA is still set to 6.4.0 as right now I still believe it will operate fine.