The Virtual Urantia Book currently runs on Windows based PCs. Soon it will be able to run on any computer that has access to the Internet.

For now, until the Internet inferface is ready, you  need 150 megabytes of memory to run the program. Could be a problem for computers that are older than 2002 or so. Not a problem for a modern computer. If your run Firefox, the browser, it takes about the same amount.