You want to download a file that is a JAR and what you are using is Opera Mini 5 beta 2, which is redirecting to default browser when a jar file is clicked.
This is what I am doing. First set up your Om5b2 permissions in the app manager. Make sure you set the Write/Edit user data permission to Ask Everytime.
Next. When you are browsing and you found the JAR you want to download, click on it and immediately press stop. Go to the address bar and youll see that the link of the JAR is there. Copy it in your clipboard.
Then go to this address: [hidepost]http://krunchit.net[/hidepost]