Question Is CrystalDiskInfo still safe ?

Use tools/hash/built-in signatures to authenticate/verify.

Use VirusTotal. Upload the file, and almost certainly, you'll get the same link as above. If you do this for all your executables, it may put your mind somewhat at ease.

Also, if you press Alt+Enter on the file in File Explorer and click on the "Digital Signature" tab, it will show you the signer, which is "CrystalMark Inc." This is usually the signature that indicates the authentic author released the executable.
 
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