( assumed 'VERSION' )... Troubles after attempt update from 2.1.0.2 to 2.3.0.2

Dear OC'rs,

I got myself in troubles after I attempt to update from 2.1.0.2 to 2.3.0.2
The notice and Warning's are at the install page at http://www.somewebsite.com/install
Did anyone else experienced the same while updating from 2.1.0.2 to 2.3.0.2?

Thanks in advance!
Anon101

Notice: Undefined variable: index in /domains/... .com/DEFAULT/system/framework.php on line 3

Notice: Use of undefined constant VERSION - assumed 'VERSION' in /domains/... .com/DEFAULT/system/framework.php on line 11

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /domains/... .com/DEFAULT/system/framework.php:3) in /domains/... .com/DEFAULT/system/library/session.php on line 30

Warning: Cannot modify header information - headers already sent by (output started at /domains/... .com/DEFAULT/system/framework.php:3) in /domains/... .com/DEFAULT/system/library/session.php on line 50

Warning: Cannot modify header information - headers already sent by (output started at /domains/... .com/DEFAULT/system/framework.php:3) in /domains/... .com/DEFAULT/system/storage/modification/system/library/response.php on line 12

Something went wrong during the upgrade. Restore backups. You need to upload fresh files of Opencart first before applying the upgrade.

Hey straightlight,
Thanks for your reply!
I merged the old files with the new version... not the way to go?

Upload your fresh files on a separate folder. Then, you need to import your database afterwards by running the upgrade with extended PHP Time Limit tolerance to succeed this upgrade process. Otherwise, for the database, you can always import your database with the use of an extension from the marketplace.

Straightlight, Thanks I will give that a try. Have a great day!