I already try the lighting, it can't support.
Octane does not have a "Point Light" concept - it needs geometry to produce the light - so you need to create geometer emitters and apply an emission material as per the manual. Over time you can/will build a library of AutoCAD light geometry items and Octane material defaults which makes importing emitter light very quick and easy to setup.
Regarding the license, can I install & use it for desktop & laptop? Example, I use in desktop at office and use it in laptop while presentation.
You can do this, but you would need to de-activate both Octane Standalone and the plugin at the office prior to activating both at home, then de-activate both at home prior to activating at the office. It's not a process I recommend, but be done.
If I buy this license is version 1.20 now, in future when your got new version or upgrade, is there any extra charge for it??
There is an upgrade fee for Octane Standalone such that the price for Standalone 1.5 + upgrade = price for Standalone 2.0. So there is no benefit in waiting until Octane 2.0 Standalone is released. The plugin update policy has not been finalised yet.
Paul