What exactly are the errors you're getting? It could be anything from Itch's servers being unstable to not having enough free storage. Due to the way Android deals with APKs you'll need 2-4 times as much storage space available as the APK actually requires in order to install it (so roughly 6GB).
If you're getting an error halfway through downloading then it'll be either Itch's servers (unlikely, but possible) or unstable WifI (more possible), yeah. Nothing I can do about it either way, unfortunately :(
