How in the world do i load software onto my 39gii

[iluvcars3man]

Basically I managed to get a 39gii for super cheap and I want to load some software onto it but for some reason it never seems to work right and if it does load when i run it the calculator hangs on the hourglass icon and i have to remove the batteries. Also if it helps I have a windows 8 laptop and a windows 10 desktop and i tried it on both. I really dont want to have to install windows 7 on my laptop