I Swear To God I went and read there!!! That's how I found that I need to install SDK repo manually!!! What did I just create the solution?!! Hahahaha you're unbelievable!
If after a few times of trying you are still unable to open N9QTweak, do the following: 1) Use MeeCatalog from the Store to add from the well-known catalogs list, Harmattan SDK repository 2) In terminal as root type the following: apt-get update apt-get install bash 3) Now try opening the app again