@KenB I appreciate your time in replying, thank you.
I think you're right, some so-called "free" are literally up to the point of installation, but beyond that need a license. I need to move 25GB, so I guess anything "free" would not work to that extent.
What I need to decide is, if £50 is worth it for a license, and since this is a lot cheaper than a larger HDD (SSD), then I think I will inevtaibly end up paying it.