Trying to upgrade from 2.2.6 to version 3. Successfully ran the System Check module. Went to the upgrade page [ https://formtools.org/upgrade/upgrade_receipt.php ] to generate the Upgrade Zipfile, but keep getting a "server is too busy to handle your request right now" message. Tried repeatedly, no luck. Any thoughts?
I'ḿ still running PHP 5.5 (want to upgrade once the Formtools upgrade is successful) but according to the documentation that should not be an issue.