Unable to update the MongoDB driver to any version above 1.29 on either environment.
Using the standard procedure which we used to update to various versions up to 1.29, no longer works:
1) Download newest .dll version (https://pecl.php.net/package/mongodb)
2) Stop server
3) Replace php_mongodb.dll file with new one
4) Ensure the "extension=php_mongodb.dll" line is in php.ini (last line of file)
5) Restart server.

Verify that mongodb is missing on the phpinfo page
Error from error.txt:
"PHP Warning: PHP Startup: Unable to load dynamic library 'C:\\xampp\\php\\ext
php_mongodb.dll' - %1 is not a valid Win32 application.\r\n in Unknown on line 0"

When we repeat the same steps but instead install 1.29 is works fine.