How do you setup vpn for tablet? The apk version only support mobile so I can’t install it.
Frankly speaking I never tried to install mudfish app in tablet. However I thought it should work for it too because I can’t find any reason why it should not work.
Which error message are you getting if you try to install it with apk file?
From Google store, it says incompatible with device and only labeled as mobile. I downloaded the apk directly from mudfish.net it says there was error parsing the file.Im on Samsung Tab 10.1 2014 Edition. Android ver 4.4.2
Android v4.4 is KitKat whose API version is 20. However Mudfish app requires at least API version 21. 
So you should update to at least Lollipop.
First could you please test with Full VPN mode again? I’m curious that this issue is from the steam item of Mudfish or mudfish node.
order id is
MMFMFQ5XS8
If you want to refund the inApp purchase of iOS, you need to contact to Apple because they doesn’t provide the admin console to refund the user’s transactions.