Sorry, I don’t really know on this. Maintaining our own standalone launcher is a real burden. People have weird esoteric setups, due to the ISP they use, etc. And just get issues we cannot reproduce and fix. This is why Steam is highly recommended, as it has been tested and developed by a team far larger than us.
If you try and save this link: http://game.automationgame.com/manifest.xml
It should be 694kb large, and should end with the following:
<FileChecksum>
<fileName>
assets\data\cars\tutorials\Tutorial1\Car\Platform.lua
</fileName>
<CheckSum>89F7869B9CE8B2C1AA25A6F97CE84F8A</CheckSum>
</FileChecksum>
</ArrayOfFileChecksum>
If the manifest file isn’t that big, or doesn’t end with the above lines, than something is broken between ours servers and you. And is out of our control.