This software is classified as abandonware.
https://en.wikipedia.org/wiki/Abandonware
According to Wikipedia:
Commercial software owned by a company no longer in business
When no owning entity of a software exists, all activities (support, distribution, IP activities etc.) in relationship to this software have ceased.
If the rights to a software are non-recoverable in legal limbo ("orphaned work"), also the software's rights can not be bought by another company, there can not be copyright enforcement etc.
Also, once a software product has become abandonware for a developer, even historically important software might get lost forever very easily, as numerous cases have shown.
I have taken it upon myself to preserve the software, I have uploaded the last revision 6 iso file to my dropbox because I don't know how long the google drive link will be live.
If you have issues with your software please direct message me for trouble shooting if you already own it.