This is not tyranno this looks like Visual Novel Maker, (timestamps ran on this before motkeyz changed away from it).
I know one of the problems with this one, was that since it's a steam application, it liked to force updates, updates that could also potentially break your game project irreversibly. The editor itself is done in java i believe.
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Sorry, geeking out a bit over game engines
Correct me if i am wrong though, i never used the engine much myself, only to use as a reference when migrating from it.
/A