To Access Customization Centre, Module you need to at least have Validation Manager, Layout Customization or User Defined Fields.
For 2019.0.1.2 version and below
Step 1 - Click Tools > Click Customization Centre.
Step 2 - Application Difference window will appear >Double Click 'QNE Business Solutions'
Done.
For 2019.1.0.0 Version and above.
Step 1 - Click Maintenance > Click System Option.
Step 2 - On System Option window > Press 'CTRL+SHIFT+F9' > Password Screen will Prompt.
Note: Insert Password : qne2004> Press OK.
Step 3 - Click Tools > Click Customization Centre.
Step 4 - Application Difference window will appear >Double Click 'QNE Business Solutions'