Update README.md

Author: yushulx

README.md

@@ -20,7 +20,7 @@ This repository provides a simple example demonstrating how to build a cross-pla
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 ## License Key for Dynamsoft Barcode Reader SDK
-Obtain a [30-day free trial license](https://www.dynamsoft.com/customer/license/trialLicense/).
+Obtain a [30-day free trial license](https://www.dynamsoft.com/customer/license/trialLicense/?product=dcv&package=cross-platform).
 
 ## JNI Header Generation