Hi William,
I am working on CW support but I didn't hear of the CW download package from officially website include virus files.
you may send the "virus file" name list here, we can check.
I ever received report from customer, McAfee may prevent CW install process. disable McAfee during install can solve the problem.
or you can try it on a home computer without McAfee for download and install.
Note: CW install must with admin right.
Have a great day,
Jennie Zhang
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