I bought Lightroom 6 as a download to upgrade from LR 5.7 last night. The download failed so I came to try again today and now can't find the link!
Look at forum header ... there are news .. including a link to: Keeping Lightroom Up-to-Date
Here is the direct download link for Lightroom 6: New Adobe Lightroom 6 (CC) Direct Download Links – Free Trials | ProDesignTools
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