Hi @Dho Delo ,
Welcome to Microsoft Q&A!
Please check the Visual Studio 2015 system requirements and update your Windows 7 with the latest Windows Updates.
Meanwhile, please view the document: UPDATE: SHA-1 signed content to be retired.
• On April 26, 2021, Visual Studio 2015 and older web installer files were removed from the Microsoft Download Center. These products can be installed from ISO images available at Downloads - Visual Studio Subscriptions Portal.
It shows that you can’t install it from online web installer. Please search “Visual Studio 2015 with Update 3” and select “DVD” file to run it as administrator.
Sincerely,
Anna
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