Hi Ciaran
I just did a test upgrade to J4 on a junk URL - I uninstalled Skylar before doing so but left your other J51 modules (e..g. layer slideshow, news) in place.
On completing the upgrade, I could enter the back end perfectly well but the front end was broken with a message about one of the J51 modules, so I uninstalled them all.
I've now noticed that I have none of the modules built using your modules. I reinstalled all the modules but no difference.
Is there a better way forward than just to recreate the whole lot please? I've used your code extensively and to do so manually will take a while!
L