I am running v0.21.1  after updating from version 0.17.

Twice in the past month v0.21.1 disappears and v0.17 begins running again (note the "unknown rules ..." message appearing which doesn't when v0.21.1 is running.) I reinstall v0.21.1 each time.

Why is v0.21.1 being replaced with my old v0.17 install? This is a Windows 10 installation. Thank you!