Is it possible to re-install Ical Vers.8 on OX X10.10.5
My calendar is not updating my company's Calendar, leaving me with the last calendar update they did. On the window to the side of the calendar, where it shows which calendar you have open, I have a triangle with an exclamation point, but no indication of why its there or what is happening.
Mac mini (Late 2012), OS X Yosemite (10.10.5)