If it's Maya 2019 or earlier, then you can search for 'substance_linker.dll' in the Maya install directory, C:\Program Files\Autodesk\Maya2019 for example, and then delete it.
You will need to ensure that the old 1.0 plugin is completely removed from your system.
The 7.0 version linker is from some odd upgrade path from updating Maya to 2020.1, etc. You can uninstall the plugin, ensure that you delete C:\Program Files\Allegorithmic\Substance in Maya\2020 entirely, then reinstall the newest version.