Found in on his website:
If you want to use this plugin with a free RPG Maker game, you can do it for free and there's no need to contact me. I only ask you to give credit to "Khas" or "Khas Custom Scripts" somewhere in your game. You may include my blog url if you want.
This plugin is NOT FREE for COMMERCIAL use. If you want to use it on a commercial title (any game that you may sell), you must pay a one-time $15 USD fee (payable via PayPal only - please send me an e-mail, see Contact page on my blog). This license covers commercial use for your current and future projects, and it allows you to use all my plugins.
If you want to use this plugin with a free RPG Maker game, you can do it for free and there's no need to contact me. I only ask you to give credit to "Khas" or "Khas Custom Scripts" somewhere in your game. You may include my blog url if you want.
This plugin is NOT FREE for COMMERCIAL use. If you want to use it on a commercial title (any game that you may sell), you must pay a one-time $15 USD fee (payable via PayPal only - please send me an e-mail, see Contact page on my blog). This license covers commercial use for your current and future projects, and it allows you to use all my plugins.
If you're asking what the license agreement means, it means if you are going to make any money while using his plugins, you have to purchase a license for his plugins. If you aren't making any money in any games that use his plugins, all you have to do is credit him instead.
Here's the problem, we want to purchase the license, but he isn't to be found anywhere. I've tried contacting him via e-mail, like he asks in his website, but he isn't responding. I hope he's okay at least.