There was an "RSLogix 500 Micro Starter Lite" version, part number 9324-RLM0100, which was free of charge and supported only the MicroLogix 1100 and 1000 controllers.
It's my understanding that they stopped doing support on it a few years ago, so the last version was 8.30, which I think supports firmware up to v10.0 (a new MicroLogix 1100 will have v16 firmware, I think).
It was available via the Product Compatibility and Downloads website, but I'm not sure if it's still there.
I don't think the RSLogix 500 Micro "Starter" and "Developer" editions are sold anymore, either; I think you can buy RSLogix 500 Starter, which covers the MicroLogix and supports offline editing of SLC-500's.