Upgrade files for SugarCE 5.2.0f?

Hello, 

I have Sugar CE 5.2.0f (Build 5688).

I understand CE is discontinued, but I need the upgrade files to push it to version 6. 

Two questions:

1 - Can someone tell me if the upgrade files for 5.2.0 would work for 5.2.0f

2 - If the answer is no, how can I upgrade to 6.x?

The old files from sourceforge can be found here:

SugarCRM - Browse /OldFiles at SourceForge.net 

There are no files to upgrade 5.2.0f in that repository. I double checked.

Thank you.