Helllo, @shirley-studebaker!
This type of problem can be easily caused by some of the plugins you have activated…
To check if that is not the case, please deactivate ALL plugins temporarily, and if then the website works normally, activate the plugins one by one until the problem reappears so on that way you will find which plugins caused the error(if any).
Also, contact your hosting provider support to check which PHP version you have on your server. Our theme requires a minimum version of 5.6, (we recommend version 7.x)
Regards
Removed one plugin which was causing technical error but even though update no longer causes technical issue the design is destroyed by the update. What a huge pain and time suck this is. I am going to suggest to client to use a different theme.
@shirley-studebaker
I think your client should change developer 😉
Regards