Just a small reminder .
If you own the licence to a game on steam - you own the licence to every version of that game (unless some legal trouble arisesed or the publisher/developer goes berserk by requesting steam to completely take down their game and developer/publisher account from steam) .

There is exists a tool that allows to download any version of games that you have purchased . Just google how to set it up and use it .

Sure , "steam beta branch" is a much more user friendly solution than some 3rd party tool .
But since REDCON is a single player game , modding of the 1.x version will never die . Even if the devs remove the beta branch (which i doubt) , the game will still be legally downloadable from the steam servers .

bad news everyone
unfortunately the "res" folder got ultimately nuked, means no more mods...
...but don't worry, the devs actually decided to keep it for some time, quote, "so modding doesn't die out." I guess we got a second chance from the devs, thank you hexage

Sigh .
Since this game has so little of official modding possibilities , sure , if you want to call "retexturing" as "modding" , its ok .
This game deserves an official modding toolkit

But for anyone who interested in "mods" :
Community members of this game is extremely passionate and dedicated to make this game have more replayability , so that they try numerous times and each time achive to create better and better "sandbox save" files .
As you can guess from the name - it is a 7% campaign save file with all possible forts/weapons/utilities/defences/perks/medals .
Here is the most recent and most complete one called "Sandbox commander" -
https://youtu.be/c4ogDZhH1Xg

Here is guide from creator of "Sandbox commander" himself .
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2942215088

And if you are wondering "but how were these save files created ?" :
Well , i'm not exaggerating about the passion and dedication of this community members .
These save files were created using RAM modification with a program that can cause you to get valve anticheat ban in multiplayer games . You have probably heard about this programm :)

wait there's mods?

Hm, that's a hard pick... I think i'll go with the Cult mod, you can get it here: https://drive.google.com/drive/folders/1uiuR3myV3pVndwS1hwGZfmnsmiak_V95

Can you recommend any mods?