Unfortunately, it's not possible to use the downloadable vox-l app because of the reason you described. There isn't really a workaround for it, except to use the vox-l simulator within the badge tutorials. Are you having trouble with it not loading in the badge tutorials?
You can also use vox-l in the freeplay modding area. Go to https://mod.learntomod.com/programs and select either Blockly multiplayer of JS multiplayer (don't choose singleplayer). Then enter a title.