buying x4

[danderson7]

Hi

I'd like to get back to using chief after many years since I last used it.
I have an opportunity to buy x4 from a colleague who no longer uses it.

He wants to sell it, but I need to know what is legitimate for transferring license to me and removing it from his computer?
If that's a possibility - what would be the upgrade price/policy to upgrade to x5 (or the next version)

Are there any other issues to consider?

Thanks for your help.