Simulation software for two stages on a Mac

Is there any reasonably easy software to do two-stage simulations on a Mac? I want to predict altitude and fine tune separation and upper stage ignition. Please do not recommend Rocsim 9, I have it and while it works for a single stage simulations, it is broken for two-stage simulations on Mojave (I even watched tutorials to make sure I was doing it correctly). Do I need to buy a cheap Windows laptop to get something that works?

Have you tried Openrocket? It’s freeware, do it has a few glitches, but it simulates multistage rockets well, and the price is right.

What are you planning?

Open Rocket should work on a Mac. There’s also RasAero II but not sure about Mac compatibility

I have not tried Openrocket, I should give it a try. I am just doing Wildman 3" rocket two-stage. I have either a 54mm motor booster or a 75mm motor booster.

This link might help too.
https://www.rocketryforum.com/threa...d-mac-to-solve-all-your-java-problems.143540/

I use Open Rocket for all my 2-stage flights. On my Macbook
Air. works great.

Thanks for all the input. OpenRocket is working great.