Vanilla 1.1.9 is a product of Lussumo. More Information: Documentation, Community Support.
You shouldn't need to uninstall the other version. You can simply move you existing 2.0.4 installation to another folder (than ~/Applications) and use Ulysses from there while having the App Store version (2.0.5) installed in your "Applications" folder.
I'll try to have the bug fix ready as soon as possible.
Götz
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