I purchased an iPhone app and deleted it?

So, I had an app called Picfx (cost $1.99) on my iPhone4. When iOS7 came out, I needed more space so I could download it. Therefore, I deleted Picfx. I did so because I had done something like this before where I didn't use the app I purchased so I deleted it but I was able to download it again for no charge. Why can I not do it now?

Because apple is not consumer friendly

Once you upgraded you lost it my friend

It is very possible that the app does not work with iOS7. Either the company that wrote the app must up date it to work with iOS7 or Apple must release a fix that will allow the app to work. Do not expect anything soon.iOS7 in my opinion, was not ready for release and many an iPhone crashed after people updated their phones. My grand daughters iPhone stopped working all together. You are very lucky that at least your phone is still working. I wish I had not updated my iPad to iOS7 but I'm stuck like you. Sorry.