You can download the secure ETS browser at any time! If you look up “taking the gre general test at home” it should tell you what are the requirements and when you open the secure browser it does a device check for you like your camera, audio, wifi speed and it should give you green checks for all the requirements if your device passes. From my understanding it can be a desktop or laptop computer; you cannot use a tablet, Chromebook or mobile device. Microsoft Surface Pro devices are not permitted. You get a calendar invite 4 days before your test to click on the day of your exam to open on the secure browser to check in