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I'm not sure if redactor supports IE8, but I get an error when attempting to insert a link.
Sounds like it's in our links plugin to Redactor. I'll take a look and see what's up.
This fix seems to solve it:
Redactor 9 has been released. Any plan to integrate it to Elefant CMS?
We had originally targeted the new beta but reverted to Redactor 8 when they ran into some snags over there. It should be fairly quick to upgrade now, just need to update the various Elefant-specific plugins and we're good to go!