Where do VST3 plugins install on Windows?
On Windows 10 and 11 the standard path is C:\Program Files\Common Files\VST3. Every VST3-capable DAW scans it by default, so a plugin installed there needs no extra path configuration — only a restart of the DAW and a rescan.
The VST3 specification fixed a single shared location precisely so users would stop maintaining per-DAW folder lists. Installers that let you choose a custom folder are the most common source of 'missing plugin' reports.
If you inherited a machine with custom paths, check each DAW's plugin path settings and make sure the shared folder is in the list.
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It usually works, but a reinstall to the default folder is safer because some plugins ship supporting files alongside the binary.
That is for VST2, a different format. VST3 hosts do not look there.