Digital signature is an important part of encryption, and the things involved are too complicated. Simply put, it is used to ensure that the software is provided by the publisher. If others tamper with the software (such as releasing the Trojan horse), it will not pass the verification of digital signature. Generally, digital signatures can be sent in software installation packages. If it is missing, it may be that the software was maliciously modified, but it was deleted for fear of system verification. You'd better find a regular website and download it. It's not safe without signature.