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Hello and thanks for using JustAnswer.com , I am Serge and I will try my best to assist you.
Please allow me a minute to collect info and prepare the answer
Have you tried going to the Iolo website and re-download full software instead of update?
here is the link to the website: http://www.iolo.com/downloads/download-system-mechanic/
you can either use link at the bottom of the page to download update, or login to your account and see if you can download a full version again
i will be waiting for your reply