The innoextract version you're using is outdated & can't handle the newer installer.

Exact ;)
A newer version can be installed on Ubuntu and derivatives with [url=https://launchpad.net/~arx/+archive/ubuntu/release]this PPA[/url].


EDIT: Sorry, broken link, can’t do anything about it unless GOG decides to hire me.

(it doesn't like the tilde / ~ in the URL)

more info

./play.it version 2.3.0 is out, with a couple notable improvements:  
A handful of scripts have seen a significant update since last announcement (nearly 90 scripts actually got an update, but I spare you the full list):
• A Good Snowman is Hard to Build
Add optional icons pack
• Chaos Reborn
Run tha game in a window on first launch, to avoid issues related to fullscreen mode on some configurations
• Darkest Dungeon
New GOG installers supported
• Deus Ex
New GOG installer supported
Fix a crash related to a missing directory
• Invisible Inc.
New GOG installer supported
• Renowned Explorers: International Society
New GOG installer supported
Store saved games and settings outside of ./play.it prefix
• The Settlers II
New GOG installer supported for German version
• Undertale
New GOG installer supported
• War for the Overworld
New GOG installer supported
Fix a bug with support of the Humble installer

And of course we have some new supported games with this release:
• Brutal Legend
• Ghost Master *
• I Have No Mouth And I Must Scream *
• Jade Empire
• Star Wars: Knights of the Old Republic II *
• Teenagent *
• Torchlight II *
* game previously supported by ./play.it 1, that got a new ./play.it 2 script


Let’s game!

I have installed SMAC with your script (https://wiki.dotslashplay.it/en/games/alpha-centauri) and the extraction/installing process went fine. But when I start the script, I get a doubled/mirrored tearing screen at the starting credits (loki and firaxis), the movie stars and then a white screen appears, onl leaving me the option to crtl+alt+backspace to restart the DE. Sadly I can't post screenshots because when I take one ironically everything looks ok and my cellphone cam is terrible. Could you help me? Thanks.

You might be able to switch between fullscreen and windowed mode with Alt+Enter.
Does it help going past your display bug?

Yep, thanks! I feel stupid now...
About the sound, I am getting none. Is there something that can be done? (I just hope is not a simple thing)

You don’t have to, it took years before I noticed I can do this ;)

Give a try to this script, it might help with your sound issue:
https://github.com/Amadren/play.it/blob/master/Games/Sid-Meier-s-Alpha-Centauri/sound_fix.sh

Thanks for the link. I have tried installing some alsa libraries, but no success so far.

When I try to install the suggested module I get the following message: modprobe: FATAL: Module snd_pcm_oss not found in directory /lib/modules/4.10.0-38-generic

What distribution are you trying to run the game on?

Mint 18.3

It looks like this version uses Ubuntu Zesty linux package, but I can’t find the required module in this one. It was included in the previous kernel (4.4.0 for Ubuntu Xenial), so I guess it has been dropped since then.
Sadly I do not know Mint well enough to tell you how to include this module, maybe you need to rebuild the provided kernel from its source.

Thanks for looking deeper and for your efforts in building gaming packages. I thought that installing alsa libraries would do the trick, but I think ou are right about the kernel.

You might want to post about your sound issue there, it might help your question to get a better visibility.

This thread may be a good place too.

Work never stops on ./play.it side, not even during new year festivities… That’s why you can enjoy the fresh new 2.4.1 version right now:  
Quite a lot of individual scripts update, but as usual I handpicked only the ones that might interest a ./play.it user:
• Chaos Reborn
New GOG installer supported
• Owlboy
New Humble installer supported
• Pillars of Eternity
New GOG installers supported for main game and expansion
Add support for Deadfire DLC
• War for the Overworld
New GOG installer supported
Add support for Underlord Edition DLC
Fix playing of tutorial video for My Pet Dungeon

As you can see, we have a bunch of great games newly supported, so you won’t suffer from lack of games in early 2018:
• Airline Tycoon Deluxe
• Anno 1503
• Atlantis: The Lost Tales
• Dungeon Keeper II *
• Epistory - Typing Chronicles
• Gomo
• Hand Of Fate
• Kingdom New Lands
• King’s Bounty: The Legend
• Pandora: First Contact
• Pid
• Political Animals
• Pony Island
• Renowned Explorers: More To Explore
• Risk of Rain *
• Robin Hood: The Legend of Sherwood
• Shadowrun Returns *
• Shelter
• Steamworld Heist
• Terraria *
• The Last Tinker: City of Colors
• The Silver Case - Demo
• Thief 3: Deadly Shadows
• Worms Armageddon
* game previously supported by ./play.it 1, that got a new ./play.it 2 script

Have a happy new year, and as always: let’s game!