Thanks for the follow up, Chris. I did update the PHP as suggested by the link, increasing max settings.
I thought that the theme update was going to work as it got past where it had previously, but then the following error message came up with a install denial:
Unpacking the package…
Installing the theme…
Destination folder already exists. C:/wamp64/www/STP/wp-content/themes/*filename*/
Theme install failed.
Any ideas? I’ll admit that I am new to working with WordPress and themes. I had at least followed the suggestion of the theme provider to work in a Child version of the theme so that installing updates would not break my current work. So I would have assumed that since I was updating a theme, of course the destination folder SHOULD already exist. Not sure why that would be an error.