I am sure you figured it out by now, but find the ...4.31.min file and copy it to the css folder....
Check the js and css folders included with the 4.95 update. Do they include the files the exception is complaining of (full name)?
I would be very surprised that they are not included in the 4.95 update, unless I was drinking (again) and forgot to update them...
I have not yet upgraded to 4.95, so I have no experience of this. Yet, in the past, as with every update, I use the NEW js, css and other required folders (copy to my project) and everything works well... When I get around to upgrading to 4.95, I do hope (and expect not) I not encounter what you are now experiencing ... I have done this since version1.0, and followed the process and rules...