Convert mcv files back to jpg

I have used ManyCam while teaching with DaDaAbc for the past 4 years. I’m now teaching independently using the ClassIn plateform, with ManyCam as my camera.
I have 100’s of mcv images that I’ve made over the years but now need to convert them back to jpg files so I can use them directly within the ClassIn app.
I can’t find a way to do this either through ManyCam itself or using any other “conversion” app. Please create a way to do this for those of us who have had to switch to teaching independently.
Thanks!
Teacher Chuck