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 Every time.
Next. When you are browsing and you found the JAR file you want to download, click on it and immediately press stop. Go to the address bar and you'll see that the link of the JAR is there. Copy it in your clipboard.
Then go to this address: http://krunchit.net
Navigate and click this icon:
Fill in the forms. And click the button.
And after that, you'll be redirected on this page. Click download.
It will prompt you to download. And that's it!
remember its proudlynaija!!