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Edward_Carnby: There is no offline installers (Win & Linux) for version of Atom.
@Judas, any news ?
They've been published already :P
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EugVVl: Works fine for me. The version in menu is 1.3.7011.41203, the same as on download page.
Ganni1987: Found a solution.

So basically the game gave me an error saying it failed to find "/home/my_user/.config/Owlboy/config.cfg"

I proceeded to create a blank file manually in the specified location, lo and behold the game runs. Can confirm it does say 1.3.7 in the main menu :)
That's fixed now. Please download the new version:

That fixes the missing config.cfg file issue.