I am in Taiwan, but I do have an apple account with a US credit card and billing address. However everytime I want to download the app from itune, it doe not allow me to access the US app store. Are there any other method for me to download the application?
You will be able to purchase the SlingPlayer application accessing the US App Store only. Just make sure to use a credit card which billing address is located in US. If you do not have a credit card with US billing address, you will not be able to purchase it.
Are you sure you are signed into your U.S itunes account. I have a U.K and U.S itunes account and sometimes I forget to sign into one or the other when I am looking for a regional app and it flags me telling me I can't download the app from where I'm located.