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The bootstrap folder should be "/themes/Bootstrap", with a capital B.
If it isn't, rename it and delete cached theme files from /cache/
"Specified key was too long; max key length is 767 bytes" error.
Apparently an InnoDB/MySQL v 5.6 problem. Circumvated for now by changing varchar(255) to varchar(191) in the two unique columns instructure.php.
Now the app is enabled from the dashboard.