Went to download the latest ccleaner and it seems windows 10 1903 latest version blocks installation of ccleaner.
I know I can run anyway but thought you should know this is happening
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Windows protected your PC
Windows Defender SmartScreen prevented an unrecognised app from starting. Running this app might put your PC at risk.
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Application:
ccsetup563.exe
Publisher:
Piriform Software Ltd
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@ukheatherNew exe and fresh certificate. The number of pings to the support desk seems to have dropped on this now, so assuming that your Windows Defender is now all caught up?