Use Sphere to Cube online tool, when you need to covert your 360 panorama into 6 cube images. At left side squire you can drop your image, or click left side grey squire to select your 360 sphere panorama and upload. As soon as the file is uploaded into the server the converting process starts.
Please be patience the converting takes some time, you will see running flower. If the process continue then server still works to create 6 cube images for you, please do not close page. When the process is completed you will see small preview at right side accordingly to each projection, please click download at each side, so you have all 6 images.
You will need all 6 images to covert cube into sphere to use as one 360 panorama image. Please be patience. If any error appears the converting process stops and you will see red error message, if the covering is running, then all goes well, just wait :)