oculus has an update but it wont let me download it. it says i dont have enough space but i dont know how to change wich drive i will download to. because i have enough space on my second drive
You'll have to uninstall Oculus and reinstall on another drive with more space. See this article: https://support.oculus.com/1142129705828091/ Note, this will also uninstall your VR games, and you may lose saved game files.