Hi @Anonymous ,
Welcome to Microsoft Q&A!
Could you tell me how you downloaded the install.exe? DVD or EXE?
On April 26, 2021, Visual Studio 2015 and older web installer files were removed from the Microsoft Download Center. Please download and install the Visual Studio 2015 Update 3 ISO image at Downloads - Visual Studio Subscriptions Portal.
Besides, you can try the workaround shared by Valentin-8146(ServicedSetupPayloads\OfflineCache\installers\VSU_14.0.25420\en\0\vsupdate_KB3022398.exe /uninstall)
By the way, the VS2015 is a old version, I recommend you install a newer version for better work.
Sincerely,
Anna
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