Points to take into consideration:
Ensure that your Resolve is updated to the latest official release. IMPORTANT: if you are using AppStore version of DVR, uninstall it and get it directly from BlackMagic Designs website
Moreover, our plugins are not supported on 'beta' versions of Resolve.
ensure that your mInstaller is updated to the latest version. The latest release is always available for download on our website
Optional: try changing mInstaller's default download folder location - create a new folder on your Desktop - name it e.g. “test”. Now, go to mInstaller's Settings and change the default mInstaller download location to this new folder:
Finally, try installing the plugin again with mInstaller.