SCS is not free but they will let you download a demo that is only crippled by a work session time limit.. of I think 1/2 hour.. So you can see if it works for you and your equipment before you put out the money.
I will verify but pretty sure it does let you load and save. I have licensed copy at the theater and mess with testing at home on the demo. I may have to download the latest demo to make sure that’s still true