Hay! Just start to play with engine. Can I sell comercional games made in your game engine? Also, is it posible to add custom textbox and buttons? Thanks
Hello! Not sure if you still need an answer, but I've been messing around with the engine since it came out (not a Dev, just a User). As far as I remember there is no ban from using CapsuleVN to make commercial indie games (big companies, give them some moolah!)
You can absolutely change the text boxes and buttons. First, here's how to change your textbox: you can switch to Expert mode (toggle at the top) then select UI Custom as on the screenshot. It'll give you the chance to change text and boxes etc with what is already in the box, which is a fair bit, but a little lower there's a custom option, where you can make and import your own textboxes.
Secondly, buttons. You can absolutely change these. In the same drop-down menu just select UI Customisation. This lets you change out buttons, dialogue box backgrounds, and menu images. 
If you need an interactive button that needs to act as an invisible area (like a touch map, for example) just put in a standard map image then add buttons targeting what you need, or use Point-and-Click Hot Zones in the scene options itself.
Hope that helps!
12 days ago(+1)
Hay! Thanks a lot for the guidance! Shore gonna try it as it is more simpler then Ren Py, and by side I love little creators work put in this stuff!
9 days ago(+1)
Double-checked the license, and yes! You can make and sell your games on CapsuleVN, so long as you do not sell the engine.
The detail is here: https://capsulevn.com/license.html