The App didn’t download English version and now I can’t use it

I bought the app yesterday and aftre I started to download the English offline version, my internet had some problems. So, the download stopped, and later on, when I started the download again, the app became unresponsive. I tried mailing them, but to no avail. I think I wasted the money to buy the in-app purchase, as the app is not working anymore and even if I delete it from my macbook and try and download it again, it still remains unresponsive.

K K Jha about Wiki Offline — A Wikipedia Experience, v1.74