I don't use Sage but I do work with client software, generally working for two or three companies at the same time and I have either laptops or VDI access from each of them in order to access their systems / software / Data. I don't purchase any licenses myself.
As I say, they are the only one's who will be able to tell you what you need to buy and what is supplied. If you need to buy something then that is between yourself and the company to negotiate payment for the software... Always get the money up front.
All the best,
Shaun.
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Shaun
Responses are not meant as a substitute for professional advice. Answers are intended as outline only the advice of a qualified professional with access to all relevant information should be sought before acting on any response given.