Found a solution to avoid having to install MOOSE.

Now MOOSE can be copied into the mission file, but you'll need to
include a "do file" action of moose.lua in the mission file and copy the
rest of the MOOSE files to the MIZ file.

Moose/DestroyGroupsTask.lua

@@ -0,0 +1,57 @@
+--- DESTROYGROUPSTASK
+-- @classmod DESTROYGROUPSTASK
+
+Include.File("DestroyBaseTask")
+
+--- To monitor and score the destruction of Groups in the DCSRTE.
+DESTROYGROUPSTASK = {
+  ClassName = "DESTROYGROUPSTASK",
+  GoalVerb = "Destroy Groups",
+}
+
+--- Creates a new DESTROYGROUPSTASK.
+-- @tparam 	string DestroyGroupType 	String describing the group to be destroyed.
+-- @tparam 	string DestroyUnitType 	String describing the unit to be destroyed.
+-- @tparam 	table{string,...} DestroyGroupNames 	Table of string containing the name of the groups to be destroyed before task is completed.
+-- @tparam ?number DestroyPercentage defines the %-tage that needs to be destroyed to achieve mission success. eg. If in the Group there are 10 units, then a value of 75 would require 8 units to be destroyed from the Group to complete the @{TASK}.
+---@treturn DESTROYGROUPSTASK
+function DESTROYGROUPSTASK:New( DestroyGroupType, DestroyUnitType, DestroyGroupNames, DestroyPercentage )
+trace.f(self.ClassName)
+
+	-- Inheritance
+	local Child = BASE:Inherit( self, DESTROYBASETASK:New( DestroyGroupType, DestroyUnitType, DestroyGroupNames, DestroyPercentage ) )
+
+	Child.Name = 'Destroy Groups'
+	Child.GoalVerb = "Destroy " .. DestroyGroupType
+	
+	Child.AddEvent( Child, world.event.S_EVENT_DEAD, Child.EventDead )
+	Child.AddEvent( Child, world.event.S_EVENT_CRASH, Child.EventDead )
+	--Child.AddEvent( Child, world.event.S_EVENT_PILOT_DEAD, Child.EventDead )
+
+	return Child
+end
+
+--- Report Goal Progress.
+-- @tparam 	Group DestroyGroup 		Group structure describing the group to be evaluated.
+-- @tparam 	Unit DestroyUnit 		Unit structure describing the Unit to be evaluated.
+function DESTROYGROUPSTASK:ReportGoalProgress( DestroyGroup, DestroyUnit )
+trace.f(self.ClassName)
+	trace.i( self.ClassName, DestroyGroup:getSize() )
+
+	local DestroyCount = 0
+	if DestroyGroup then
+		if ( ( DestroyGroup:getInitialSize() * self.DestroyPercentage ) / 100 ) - DestroyGroup:getSize() <= 0 then
+			DestroyCount = 1
+--[[ 		else
+			if DestroyGroup:getSize() == 1 then
+				if DestroyUnit and DestroyUnit:getLife() <= 1.0 then
+					DestroyCount = 1
+				end
+			end
+ ]]		end
+	else
+		DestroyCount = 1
+	end
+	
+	return DestroyCount
+end