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[Important] AppCheck Real-time protection will be disabled in enviroments where SHA-2 codesign is not supported.
By 1st Feburary of 2020, Microsoft will officially annouce f drops support for code sign certificates using SHA-1 hash algorithm.
So this applies to AppCheck's Real-time Protection, may cause to disable Realtime Protection, due to the failure of loading AppCheck kernel driver in environments where SHA-1 codesign signature is expired.
You can check your OS supports SHA-2 codesign by following method: Go to "C:\Program Files\CheckMAL\AppCheck\AppCheckD.sys" Click properties > Signatures and see if there's SHA-2 in the signature column.
Please use follwing methods if you were unable to find SHA-2 support in your system.
Especially environments in WIndows 7, and Windows Server 2008 R2 please use Windows Update to get your PC up-to-date.
In case if you are willing to selectively update to support SHA-2 feature, please download files for your operating system from following links.