Upgrade Failing from 0.4.6 to 0.7.1

[lama7]

Baikal version: 0.x

• I have searched open and closed issues for duplicates
• I have installed the release zip, not the source code zip
• I have moved the whole, untouched Specific and config folders to the new installation

Problem:

I'm trying to upgrade to 0.7.1 from 0.4.6, I get the following error page:

Error: Call to a member function getPDO() on null in /home3/lamafamo/public_html/calendar/Core/Frameworks/BaikalAdmin/Controller/Install/VersionUpgrade.php:98
Stack trace:
#0 /home3/lamafamo/public_html/calendar/Core/Frameworks/BaikalAdmin/Controller/Install/VersionUpgrade.php(68): BaikalAdmin\Controller\Install\VersionUpgrade->upgrade('0.4.6', '0.7.1')
#1 /home3/lamafamo/public_html/calendar/Core/Frameworks/Flake/Core/Render/Container.php(69): BaikalAdmin\Controller\Install\VersionUpgrade->render()
#2 /home3/lamafamo/public_html/calendar/Core/Frameworks/Flake/Controller/Page.php(90): Flake\Core\Render\Container->renderBlocks()
#3 /home3/lamafamo/public_html/calendar/html/admin/install/index.php(100): Flake\Controller\Page->render()
#4 {main}

Not sure if this is a server config error, or if the upgrade code is choking because of the large difference in versions. Any advice on how to proceed is appreciated.

Regards-
Gerry

[lama7]

I should add that, per the upgrade instructions, I did not touch the Specific directory.

I DID upload a copy of the config directory since 0.4.6 did not have this directory.

[lama7]

Alright, I'm attempting to do an intermediate upgrade to 0.6.1 since I just saw the note that it is not possible to upgrade to current from version below 0.6.1

UPDATE- 0.6.1 upgrade was successful
UPDATE 2- 0.7.1 upgrade didn't work but 0.7.0 upgrade successful
FINAL UPDATE- upgrade from 0.7.0 to 0.7.1 worked