Perhaps its a tech demo or something

I can confirm there was an Incoming demo. That's how I discovered the game, though I can't recall if it was on a magazine CD or a CD that came with a GPU purchase.

I am not sure if I have the disc you are talking about but I have one copy of Incoming that says "Dem Version" on the disc itself (see attachment).

I was unable to install it on my new computer (see pictures of error message), whereas I was able to install the full Rage Incoming game. I was then weirdly enough able to play the Incoming game with the "Dem Version" disc, in addition to the normal disc (by clicking on the yellow man). I am curious as to what these Voodoo 1 and Voodoo 2 installs are and how they difer from the full game.

MAZter wrote on 2023-05-02, 23:02:

I found some weird CD in my games collection, looks like not properly finished game release "Incoming" by Rage, differs from the […]
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I found some weird CD in my games collection, looks like not properly finished game release "Incoming" by Rage, differs from the original release.

...

1) Dates of creation of the main files a month earlier than in the usual release (March, not April)
2) Glitchy rendering of the Rage logo on the splash screen, regardless of the video card
3) Uncleaned fragments of the developer's code in the exe file, which are not in the regular version, for example, there are such lines:

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1C:\Program Files\DevStudio\MyProjects\income\source\Game1.c.Mar 11 1998 13:13:39
2Intel Pentium II + AGP Demonstration (c) Rage Software plc. 1997
3Thank you for viewing Incoming Engine v0.01
4OEM Build

It's this one: http://redump.org/disc/53295/

It was first ripped (at least for redump) in 2018. OEM releases differing from retail in content is not unusual.

Gorion wrote on 2024-04-02, 13:35:

I am not sure if I have the disc you are talking about but I have one copy of Incoming that says "Dem Version" on the disc itself

It clearly says OEM. There are multiple releases: http://redump.org/discs/system/pc/quicksearch/incoming

It clearly says OEM. There are multiple releases: http://redump.org/discs/system/pc/quicksearch/incoming

Thank you for the link! So interesting to see all the different versions. So that means I have two copies of the game, one where it was able to install (with the serial number 184-G3D019-00 labeled on the disc), and the other that I couldn't install (and no visible serial), but allowed me to play the game when the disc was in the drive.

I wasn't familiar with the term OEM, and so at first glimpse, calling that letter an O was very generous in my mind due to the font of the letters.

For the sake of completeness, I am including a screensot of the files between the two versions of Incoming that I have:

Gorion wrote on 2024-04-03, 10:10:

one where it was able to install (with the serial number 184-G3D019-00 labeled on the disc), and the other that I couldn't install (and no visible serial)

There are multiple releases with that serial number. What's the part number (P/N)?

There are also ring codes listed on that redump website. What's the codes on your discs?

The one I have doesn't seem to have a part number on the disc. See attached the front and the back for the numbers on the back. The code reads SF0415 IFPI L111 - And then in smaller font on the green part of the ring which may be hard to see with the picture, I see IFPI 2221.

The back of the light green disc (the one I was unable to install) is attached as well and that reads GM-Incoming GD-IFPI LD68.