How can I install apps on my Android when I have free space but Google play won't let me install?

So I have a 4.2.1 android phone and I use a 32 gb removable SD card(now it is 23 gb available). Whenever I try to install an app Google Play tells me that I have insufficient storage available. That's why I use Aptoide to replace Google play, but lately Aptoide has been doing the same thing! I can'r install anything and I always get a notification saying that my storage is full. When it's not. What do I do?!!!

Welcome to the forums. Apps always go to the internal storage. The SD card has very little to do with how many apps you can load onto your phone. You can possibly move some app data to the SD card, but you cannot load the entire app there.