![]() Right-click on your program and select Properties.How do I know if a program is signed with SHA1? In this tutorial we’ll explain how to check if your downloaded program is signed with SHA1 or not, then discuss the methods to get around the download issue. Any programs signed with SHA1 certificate after January 1st, 2016 will be flagged as an invalid signature. Microsoft released a cumulative security update KB3140745 for Windows 10 that deprecated support for SHA1 code signing certificate. The signature was never corrupt or even invalid. We finally got to the bottom of the issue (we believe). Recently we’ve also heard of our customers having this issue when downloading the Lock My Folders program in Windows 10, so we spend lots of time trying to reproduce this issue. When you download a software with Microsoft Edge or Internet Explorer, you might receive the error message saying “ The signature of this program is corrupt or invalid“.
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