Unfortunately many of their albums are unavailable to the public at large because the use of samples makes them impossible to license for streaming services.
They relented recently after 23 yesrs but the copyright issue mentioned remains so for example their "Chill Out" album was officially re-released by them as "Come Down Dawn" but the Elvis, Fleetwood Mac and Acker Bilk samples got removed as part of that.
Still available on Youtube via unofficial channels though.