It seems that 2dengine removed all of their games from Steam and reuploaded them to their personal website for sale. This means the download like below just leads to their storefront. Will update with a consistent download link.

Go to this Link [2dengine.com]
and you should see a page that looks like this.

Click on the patch 1.4 button on the bottom of the page. Save and run the installer.

1. Windows Defender might pop up protecting your computer, run the installer anyways.

1.5 Ensure that you have Chains installed and you know where. If you don't know, right-click Chains on Steam and go to Manage - Browse Local FIles.

2. Copy the Chains main folder directory to the highlighted section.

3. Complete the installation.

Run the game. It should load up in a window with the text "Chains 1.4" and you should be able to full screen to a better resolution with no jittering and other issues.

Special thanks to 2dengine for making the patch. Wish I new about it earlier as I had to do a full reinstall of Windows 10 due to a bug caused by the 1.3 version.