Hi. I want to try qb2019 pro but i don't have 30-day (trial) key license. Where i can find them?? Thanks

Welcome to the Intuit Community, @tech2000. 

I'll guide you through locating your license number in the program. 

If you're using Windows, you can perform the steps below: 

1. Open QuickBooks. 
2. Press F2 on your keyboard. 
3. In the Product Information window, look for your product name, license number, and product number. 

If you're using the Mac version, you can go to the Help menu and select Product Information. For more details, please visit this article: QuickBooks Desktop Product Info. 

You can also find the installation numbers through this helpful article: Find Missing License or Product Number. 

That's it, @tech2000. I'm here anytime you have other concerns. Cheers!