fix sth

Author: rebeccakak

getstarted/hardware.md

@@ -85,8 +85,8 @@ After you have installed the driver for your scanner, you can refer to the follo
 
 If you don't have a TWAIN scanner at hand to test the library. You can download and use a virtual scanner. 
 
-* [32-bit virtual scanner](http://www.dynamsoft.com/download/TWAIN/twainds.win32.installer.2.1.3.msi)
-* [64-bit virtual scanner](http://www.dynamsoft.com/download/TWAIN/twainds.win64.installer.2.1.3.msi)
+* [32-bit virtual scanner](https://www.dynamsoft.com/download/TWAIN/twainds.win32.installer.2.1.3.msi)
+* [64-bit virtual scanner](https://www.dynamsoft.com/download/TWAIN/twainds.win64.installer.2.1.3.msi)
 
 ### TWAIN and WIA