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Maybe you can bypass Windows SmartScreen (is that what you meant?). If not, you can try to use the snapshot download instead, which is not an MSI file but a simple .zip file that you can extract somewhere. Being a snapshot, it also includes new features developed for the upcoming Tiled 1.2.

(+1)

This is what i meant and it let me install it after i did this. The program works great, i love it.