Can you try to check error_log file? (via FTP or Cpanel, located usually at public_html or the root folder of your site)
If you can’t find anything please try to enable WordPress Debugging when updating the theme: https://wordpress.org/support/article/debugging-in-wordpress/#toc-heading
That should produce debug.log file where it logs fatal errors, please post the errors here so we can at least try to give accurate solutions.
Did you need additional help with this topic or shall we close?
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