Audacity currently looks for plugins in absolute paths. This means that if you open a project that was created on a different computer, Audacity will continue to check for the plugins in the exact same locations as they were on the old computer.
Fixes
You can replace any missing effects from the effects sidebar.
Before opening a project on a new computer, ensure that all plugins you've used are in the same location as where they would've been in your old computer.
If the troubleshooting steps aren't working for you, feel free to ask in our communities:
