Bristol Rovers brought off Jones at half-time and replaced him with Challis.
Harriers' Blake looped an ambitious 35-yard shot over the bar early in the second half.
Then on 50 minutes Larkin took a good pass from Williams inside the area and instinctively hammered a shot just off target.
Bristol Rovers made their final substition on 57 minutes with Bubb replacing Bryant who was injured in a collision with Blake.
Harriers' Smith was introduced into the action on 59 minutes, making a comeback from a groin problem, in place of Blake.
Harriers added a second goal on 61 minutes when Williams released Broughton and the big striker buried the ball into the back of the net from just inside the area.
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