[2D] [PSD Importer] Lost Crypt Demo: Trying to build to iPhone, build fails with these errors

Steps to Repro:

1. Download the Lost Crypt Demo project and Import it on a Mac
2. Go to Build Settings and change platform to IOS
3. Click on Build

The following errors occur when trying to build to IOS:

BC7 compressed textures are not supported when publishing to iPhone
Assets/Environment/Sprites/Altar/Sprites_Artefact.psb
Included from scene:
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

DXT5 compressed textures are not supported when publishing to iPhone
Assets/Character/Sprites/Sara_normal.psb
Included from scene:
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Originally reported in: https://forum.unity.com/threads/lost-crypt-2d-tech-demo-is-out-now-on-the-asset-store.794820/#post-5297763