I know these games are all available for download, but if you look at the bottom there is a faint copyright credit to Islona Entertainment.
I looked up the company on the web and it appears that they are the copyright holders for 6th Sense Investigations and put together the original compilation CD that is now for sale at EBay. Islona Ent Adventure CD
Originally it retailed at 29.00. I don't think this is a ripped version, but a re-seller of the original CD. The disc label is the same. I'll keep checking though.
OK I finally found a link to the company itself and it appears they are no longer around. They were retailing classic Amiga and other games on CD's.