Problem download/installing zotero-2.0b7.2.xpi

Attempting to download/install zotero-2.0b7.2.xpi but getting the following message:

Error
Firefox could not install the file at
http://www.zotero.org/download/zotero-2.0b7.2.xpi
because: Download error
-288

Tried several times from different computers. All help appreciated! Many thanks.
(PS Zotero is fantastic!)

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