How much does this editor cost to export locally?
Is it a lump-sum payment or an ongoing charge?
Can multiple units be deployed？
It depends what you mean by ‘export’. Are you asking:
Can I export apps built with the Editor?
Yes. See this page.
Can I export projects built with the Editor?
Yes. See this page.
Is it possible to run a local (non-networked) install of the Editor?
No, at present, the Editor can only be accessed from https://playcanvas.com. We do not offer an option for a paid local install.
Just to add to this @sheng_zhong , neither of these require any extra payment and are available on all plans including the free option.