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When I move all files from c:\Windows\Installer to E:\SymLinked\Installer and then do a mklink /J c:\Windows\Installer E:\SymLinked\Installer, reboot, and then try installing software I get errors like these from installers:

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After making the junction, I've even gone to the E:\SymLinked\Installer and made sure all apparently relevant users have Full Control, but still get the same error.

When I remove the junction and copy the Installer folder back to the Windows folder, installs work again.

I've had it working in the past w/out issue, but it seems after a recent update it started doing this.

Anyone have any ideas?

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    Did you try a symbolic link instead? mklink /d c:\Windows\Installer E:\SymLinked\Installer? Then move the contents.
    – DavidPostill
    Jun 17, 2020 at 20:36

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At last, I've put my hands into this longtime irritating behaviour. After excluding many versions (by checking back and forth), I'm pretty much certain, that it happens when:

  • older version of same app was installed
  • when installer is msiexec

Fix: uninstall previous version OR temporarily rename/remove Installer symlink from Windows dir. I've created empty Installer dir (original one), but not sure it's necessary.

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