I have received my serial number and downloaded but got this message "the signature of this file is invalid or damaged."

I have received my serial number and downloaded but got this message "the signing of this file is invalid or damaged. What can I do?

redownload the file.

Available downloadable Setup files:

Download and installation help links Adobe

Help download and installation to Prodesigntools links can be found on the most linked pages.  They are essential; especially steps 1, 2 and 3.  If you click on a link that does not have these listed steps, open a second window by using the link to Lightroom 3 to see these "important Instructions".

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