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It's better to have 5GB free space.Cause by the APK to double the amount space needed for file unzipping prosses. ( 1.9 GB + The unzipping prosses still 1.9 GB= 3.8GB.

Pro tip- After installing the game delete the apk and restart your phone to free some space. Hope it helps..😊😊😊

Create a backup of the save folder, located on Android > data > folder name "g.w.ncrow", Paste it somewhere safe. Uninstall the old apk then, install the new apk, after it was installed paste back the  save folder on Android > data. 

I have more than 5GB of free space and the same thing happened to me. Hopefully my guide is clear enough to help.