SugarCE 6.5.4 to SuiteCRM 7.6.6 UpgradeWizard gets HTTP Error 404

Unable to complete the upgrade wizard. Step 1 of checks is good. Step 2 picking the ‘SugarCE Migration 6.x to Suite 7.6.6.zip’ clicking Upload Package can see it upload the file 100% and then it leads to a HTTP 404 error.

Tried the trick of unbundling the zip file into the /cache/upload/upgrades/patches/ folder including creating a matching manifest.php still get same error.

Have already done the recommended PHP.ini changes as well.

Any ideas why it is unable to complete the upgrade? Thanks.

The SugarCRM.log has below

Sat, 08 Dec 2018 08:41:16 -0500 [UpgradeWizard] - setting session variables...
Sat, 08 Dec 2018 08:41:16 -0500 [UpgradeWizard] - At upload.php
Sat, 08 Dec 2018 08:41:16 -0500 [UpgradeWizard] - finding new files for upgrade
Sat, 08 Dec 2018 08:41:50 -0500 [UpgradeWizard] - *** Potential error: patch found with either no 'type' or non-patch type [ upload://upgrades/module/SugarMaps50a.zip ]
Sat, 08 Dec 2018 08:41:50 -0500 [UpgradeWizard] - *** UW using [  ] as source for patch files.
Sat, 08 Dec 2018 08:44:29 -0500 [UpgradeWizard] - setting session variables...
Sat, 08 Dec 2018 08:44:29 -0500 [UpgradeWizard] - At upload.php
Sat, 08 Dec 2018 08:44:29 -0500 [UpgradeWizard] - finding new files for upgrade
Sat, 08 Dec 2018 08:44:33 -0500 [UpgradeWizard] - *** Potential error: patch found with either no 'type' or non-patch type [ upload://upgrades/module/SugarMaps50a.zip ]
Sat, 08 Dec 2018 08:44:33 -0500 [UpgradeWizard] - *** UW using [  ] as source for patch files.

Do see the SugarMaps50a.zip in the module folder

Please look at upgrade.log or similar file