MOE SDK & Gradle Plugin Community Edition release 1.5.0

Which android studio version were you using? I’m using 3.6.1 which is the latest stable version and it still support gradle 5.
Or did you mean android gradle plugin version? If so, I’d suggest you to try the latest stable version which is 3.6.0 with gradle 5.6.4.

Meanwhile I’ll take a look at the compatibility with gradle 6 when I get some time.