There is a link at the bottom of the Apache article which might be helpful. Or I can just switch free office suites.
I am familiar with the solver in Libre and can run it. I just need something a bit more robust which can handle maybe 10-12 constraints. Versus, four seems to be the limit for the included feature. At least I cannot see how to add more. But not 32,000 for a >$1000 heavy duty commercial product.