Font agent 9.6.1
OS 10.13.6 High Sierra [don't want to upgrade OS yet]
Every time I open a file I get an error messgae saying that my 2015 plug ins need upgrading. Click to upgrade. I don't have 2015 plug ins. Suggestion from font agent is to upgrade Illustrator, can't do that as I don't want to upgrade OS.
Solution dismiss error message every time, really tedious.
What else can I do?