Hmm...
I found a little weird trick for the solution to this problem the other day, not sure if it's going to work for you though but I think it's worth a try.
create a new templates folder inside the templates folder
inside the new templates folder, create a new folder for the template.html you want to install.
And then from the ACP, install the theme, and put 'templates/themefoldername' (or templates/blue) as the theme location.
After that, just switch to the new theme (assuming the installation was a success)
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