I don't know what I'm doing wrong, but I can't get this to install. It says "no manager for installer."

I don’t know if it matters, but I bought it directly on itch back in February. Anyways, I go to:

my library->purchases-> Garden Path. Then scroll towards the bottom, under the itch download, and it says about steam. 

I contacted support and was able to get my email fixed.! Now I can access my steam key. :)

I see the link, yay.!! That's amazing. Me.? Not so much. Evidently when I purchased the game, I typed .con for my email instead of .com. So I can't retrieve it at all :(

I know it was hopeful, but tentative, before; we’re itch owners also getting a steam key.? 

I’m debating buying a second copy. RIP.