Opening a InDesign CC 12.1 File in InDesign CC 13.0?
I'm designing a menu for a client who originally created their menus using InDesign CC 13.0.
I have InDesign CC 12.1 and am unable to get the latest 2018 version of InDesign due to the fact that I have a Mac Pro 2009 (OS X Yosemite Version 10.10.5).
When opening the client's files, (again, created in InDesign CC 13.0), this dialog box appears:

Naturally, I hit convert and the file opens with the original formatting of their menu. My question is: now that I'm designing new menus in an older version of InDesign (CC 12.1), will the client have trouble opening my files in their newer version (13.0)? The client is requesting InDesign files, as they'll need to frequently update their menu from here on out.
Thanks in advance for anyone who has experience with this!