Good guide here from the ares team on how to make use of your current addons with Metalliq:- https://ares-project.uk/index.php?threads/How-To-Enable-Metalliq-In-Kodi-spmc..29547/
Its in noobsandnerds repo, noobsandnerds.com/portal is down at the moment but can get it from here:- http://nan.aftermathwizard.net/nanrepo
Are you installing it into file manager in kodi? Just worked for me on iphone