Career mode was all I ever played, really. It gives you more limits on what you can build, so just adding more delta-V isn’t a possible cop-out for all missions.

Install your software from the repository of a well-run distribution that has a focus on free software.
If the software is unmaintained or changes its license, the distro’s maintainers will drop it and look for a replacement.
It’s literally their (unpaid) job.