I Have problem tue install enfold

When I try tue install it take long time the have this message

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Security Alert

The file you are uploading was rejected by the server.
It probably contents viruses or trojans that can damage your website

Do not attempt to upload it again as your IP address may be blocked.
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I have try more the 4 time

I also just try to download then unzip and install the theme folder

anyone can help me… just newbie in wordpress