with “didn’t work” I meant that really nothing showed up.
with WP_DEBUG on true no errors while activating and deactivating the plugin on the network.
NEW INFORMATION :
there is a sign of the presence of the plugin on the sites ??
1) after disabling the plugin on the network I can activate it on the sites!
2) after enabling the plugin on the network it disappears from the installed plugins tab!
notice that this is exactly the opposite behavior …. I hope this gives some help
all other plugins behave correct but not “Internal links check”
PS I did a uninstall and install in debug mode and there are no errors or warnings