CAP upgrade from Capsman??

Hi! Have built a Capsman controller and added 30 CAPS all is great! The problem is with update - the option in winbox- UPGRADE in Capsman dont work! There is some secret or it doesnt work (yet)?
I run 3.7, on Capsman and 3.5… on CAPS?! Caps ar not all the same model!
Some ideas?? some script?

You have to choose upgrade policy and than you have to set the directory where proper router-os upgrade package is.