cant run CF after patch

I cant run Crossfire after this 12/13/17 patch. All goes well until I try to start CF. It gives me an error message "detected file-changing,crossfire.exe. Thats where it stopped. I attempted several reloads/download and also got a message that a threat was detected called "IDP_ALEXA.51". My Avast software would not let that run at that point and the file had to be removed. Please help. Thanks

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