For your information, confluence 6.1 not yet been release. The latest confluence version is Confluence 5.6.5 . You can download confluence 5.6.5 from this link.
Before you upgrade please backup the following :
You can get more info regarding Upgrading to confluence 5.6.5 in the below Documentation:
Hope it helps.
Try this link instead:
The 'DOC' folder always supplies the latest content available.
Do hope that helps.
Chuck Talk | Confluence Support
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