Thank you for your post.
I am unable to replicate the crash using FileMaker Pro 15.0.1 under Mac OS X 10.11.6.
Do you have another computer with FileMaker Pro installed? If so, take the Info.plist file (inside the FileMaker Pro application bundle Contents -> Info.plist) and put the good one in your MacBook Pro FileMaker Pro bundle.
If you don't have another computer with FileMaker Pro installed, then perform another full install of FileMaker Pro 15.
On a side note, FileMaker Pro 15.0.1 is the current release.
Thanks for getting back to me.
I do not have another computer with FMP15 installed.
So, I re-downloaded my FMP15 upgrade dmg.
It did not recognize my installed copy of FMP15 as a ”qualifying product” for installation.
So I used Pacifist to extract the info.plist file from the ”FileMaker Pro 15.pkg” on the FileMaker Pro 15 dmg.
It was identical to the info.plist file in my installed copy of FMP15.
Next, I managed to find my FMP14 upgrade License Key.
With that in hand, I managed to complete a full (?), fresh install of FMP15 from the ”FileMaker Pro 15.pkg”.
When I launched the newly installed copy of FMP15, and selected Help->Check for Updates… I got the same ”Internal Error” as before.
Repeat, I got the same ”Internal Error” as before.
Under Mac OS X, create a new user account, and login to the new user account.
Launch FileMaker Pro 15, and see if you are able to check for updates.
Deleted my preferences com.filemaker plist file, and a filemaker.runtime.plist file from 2013 that I found.
Upon relaunch, problem solved.