How to quickly increase the All-in-One WP Migration plugin upload limit
Increasing the 512MB Size Limit on All-in-One WP Migration Plugin
To successfully increase the 512MB size limit, ensure you are using version 6.77 or earlier of the All-in-One WP Migration Plugin.
You can download version 6.77 here
In the constants file…
/wp-content/plugins/all-in-one-wp-migration/constants.php
Find this…
// =================
// = Max File Size =
// =================
define( ‘AI1WM_MAX_FILE_SIZE’, 2 << 28 );
and replace with this…
// =================
// = Max File Size =
// =================
define( 'AI1WM_MAX_FILE_SIZE', 2 << 28 *1.2);
And you will have 16GB upload limit.