Angels have the Phone Box
I can't think of any way to verify the file is clean *before* you download it. Once it's been downloaded to your machine, you should scan the zip file with your anti-virus (Defender or whatever you're using) and also Malwarebytes Antimalware (free). I would scan *before* you unzip, to be safe. If there is anything malicious in the zip file, it should be identified as soon as the scan accesses the file.
If you've never run Prime95 before, and are looking to investigate overclocking on your system, I would suggest starting a thread here, and get some help from the experts:
PC Custom Builds and Overclocking - Windows 10 Forums
It can be a touchy thing, and you can totally bork your system if you don't know what you're doing.