some files can be damaged when retrieved from web archive
perhaps someone could test these files
they are provided in a 3 part hqx encoded archive
found here:
http://web.archive.org/web/19970606075642/http://www.steinberg-us.com/products/demos/index.html

release pdf manual:
http://web.archive.org/web/19971112134317/http://www.steinberg-us.com/products/demos/mac/CubaseVSTDemoInstall.pdf

readme text file:
http://web.archive.org/web/19971112133817/http://www.steinberg-us.com/products/demos/mac/CubaseVST3.02Demo.README

http://web.archive.org/web/19970606075642/http://www.steinberg-us.com/products/demos/mac/CubaseVST3.02Demo.Part1.hqx
http://web.archive.org/web/19970606075642/http://www.steinberg-us.com/products/demos/mac/CubaseVST3.02Demo.Part2.hqx
http://web.archive.org/web/19970606075642/http://www.steinberg-us.com/products/demos/mac/CubaseVST3.02Demo.Part3.hqx
http://web.archive.org/web/19970606075642/http://www.steinberg-us.com/products/demos/mac/CubaseVSTDemoInstall.pdf
http://web.archive.org/web/19970606075642/http://www.steinberg-us.com/products/demos/mac/CubaseVSTDemoDoc.sit.hqx

System Requirements
   
Macintosh
68040 or better, 16MB RAM, System 7.1 or higher, audio hardware & hard disk.
For native audio processing: PowerMacintosh 7100 or better with at least 24MB RAM.

there was also a windows based demo offered at the same time:
http://www.oldschooldaw.com/forums/index.php?topic=688.msg714#msg714

win version 3.0
mac version 3.02


photo above of the full version cd same version as this demo version
http://www.soundonsound.com/sos/1996_articles/jul96/steinbergcubase3.html
article on this version