Hey! The paid version does run locally. The goal is for the web and local versions to maintain as many identical features as possible, right now the web is slightly behind but we're updating it this week.
There aren't any tokens with the local version.
16GB RAM is a minimum for CPU only generations. If you have a capable GPU you only need 8GB of RAM.
There isn't an explicit refund policy, but we provide refunds to anyone who asks.
The pixel art image size for a 512x512 generation is 64x64. Both the extension and the web version handle all the size conversions behind the scenes for you.
All versions have an image input option.
Based on the hardware you mentioned, you would not be able to run it. Intel iris Xe is not a dedicated gpu, but rather integrated graphics on your cpu. You must have a dedicated GPU with at least 4GB of VRAM. You can refer to this system requirements chart for more detailed compatibility requirements: