Unable to download zip archive

We are using “Simply Static” WP plugin.
It generates ZIP archive with static site successfully (~239 Mb)
But when we try to download it inside CMS by URL generated by plugin
https://example.com/wp-admin/admin.php?simply-static_zip_download=simply-static-…zip
we get:

This site can’t be reached
The webpage at https://example.com/wp-admin/admin.php?simply-static_zip_download=simply-static-...zip might be temporarily down or it may have moved permanently to a new web address.
ERR_INVALID_RESPONSE

Nevertheless we can download it by direct URL
https://example.com/wp-content/plugins/simply-static/static-files/simply-static-…zip

We looked to the log file and see following errors
PHP Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 251210656 bytes) in /wp-includes/functions.php on line 468, referer: https://example.com/wp-admin/admin.php?page=simply-static
PHP Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0, referer: https://example.com/wp-admin/admin.php?page=simply-static

Limit was increased to 512MB so it may not be a server issue.

Please, check the plugin for similar errors.

Note: I found similar problems
https://www.ads-software.com/support/topic/download-zip-doesnt-work/
https://www.ads-software.com/support/topic/zip-archive-link-is-not-working/