Version 6.6 and later in Windows

1. Have your preferred JDK installed on your PC
2. Rename the "jre" folder in the Astah install folder to something else
3. Astah detects the latest Java (Should be the Java you installed at step 1) in your PC and then automatically uses it to run

Version 6.5 and earlier

1. Open the Astah start-up batch file (astah-pro.bat or astah.bat) with text editor. You will find the batch file in astah install folder
2. Remove "rem" from the following 2 lines, and change the value for "JAVA_HOME" to the install folder of your preferred JDK

   rem set JAVA_HOME=C:\jdk1.x.x_xx
   rem set PATH=%JAVA_HOME%\bin;%PATH%to

3. Astah detects the latest Java (Should be the Java you installed at step 1) in your PC and then automatically uses it to run
4. Rename "jre" folder in astah install folder if you had used JRE-bundled version of installer to install astah
5. Launch Astah again by double-clicking Astah icon on desktop or Start menu in Windows.