Service patch 1 is at the Act! resource page.
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Tuesday - last edited Tuesday
Have tested where ACT V21.0.update 7 is already installed and working on on 3 machines and it does not recognise the ACT 21.1 update 1 as valid its looking for ACT V21.1
Message reads This update does not apply to this version of ACT!, please verify you have the correct update.
ACT v21.0 update 7 also does not recognise that any valid updates are available under ACT notifications.
Have you tried the full V21.1 install file here: https://www.act.com/en-uk/download/download-act!-premium-v21