Microsoft has announced that it is planning to retire all content from Microsoft download center that is only windows-signed for SHA-1. Such downloads will be retired on August 3, 2020, post which they won’t be available to download and install.
Microsoft has also made it clear that starting August 2019, devices without SHA-2 support have not received Windows updates. It recommends moving devices to a SHA-2 supported Windows 10 version.
Read the full release from Microsoft below.
To support evolving industry security standards, and continue to keep you protected and productive, Microsoft will retire content that is Windows-signed for Secure Hash Algorithm 1 (SHA-1) from the Microsoft Download Center on August 3, 2020. This is the next step in our continued efforts to adopt Secure Hash Algorithm 2 (SHA-2), which better meets modern security requirements and offers added protections from common attack vectors.
SHA-1 is a legacy cryptographic hash that many in the security community believe is no longer secure. Using the SHA-1 hashing algorithm in digital certificates could allow an attacker to spoof content, perform phishing attacks, or perform man-in-the-middle attacks.
Microsoft no longer uses SHA-1 to authenticate Windows operating system updates due to security concerns associated with the algorithm, and has provided the appropriate updates to move customers to SHA-2 as previously announced. Accordingly, beginning in August 2019, devices without SHA-2 support have not received Windows updates. If you are still reliant upon SHA-1, we recommend that you move to a currently supported version of Windows and to stronger alternatives, such as SHA-2.