There is a trial version that can be downloaded and tested. The software itself is relatively lightweight in normal use. It runs fine on my 8 years old laptop.

The software is complicated becouse the topic is non-trivial (at least I find it a complicated subject when trying to do the math by hand)

I liked the new functionality in Profili 2 Pro for saving 3D design files and even producing G-Code for male or female moulds. Take the file to a CNC shop and have the mould or core machined with very little overhead for them ($$$ to set up CAM and produce G-code)