Downloading older versions of iPhone apps?

I found an app I want. For my iphone but I have 3 and it needs 5 is there any way to download an older version of it a preferably simple way because I want to buy the stuff to record a tascam ixz and shure sm57 ect but I need to know if I can download a older version of apps before I buy a App Store card thank much detail preferred

Not if they aren't available. The developers usually don't build old versions, too much work.

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