Startup Scenes Manager

Startup Scenes Manager lists compatibility with Blender versions 4.3 through 5.1, so it covers the 4.x line and reaches into 5.x. If you run a build inside that range, the addon is intended to work with your version. For anything older than 4.3 or newer than 5.1, compatibility isn't stated, so it's worth confirming on the developer's page before installing. Checking your exact Blender version against that range is the quickest way to know where you stand.

Startup Scenes Manager is released under a GPL license. That covers the terms under which the addon's code is distributed and how you're permitted to use and modify it. Alongside the code, the developer provides documentation to help you get set up. For the specifics of what the GPL allows in your situation, and for any separate usage terms tied to the purchase, the developer's page is the place to confirm the details.

Startup Scenes Manager is listed as free in this catalog, so you can add it without a purchase here. The developer offers it across a few licensing tiers covering a single user and teams of up to five or ten, aimed at personal and commercial projects, so the terms can vary by how many people use it. For current pricing and the exact licensing that applies to your use, check the developer's page, which carries the up-to-date figures and conditions.

Startup Scenes Manager ships with documentation from the developer. A demo video is also available if you'd rather see it before committing. Between the written docs and the video, you have two references to draw on while getting familiar with the addon. Both are reachable from the developer's page, so that's the best starting point if you want to review the material or follow along while setting things up.