you have just do :
Upgrade from 1.5.0 to 1.5.1
If you upgrade InvoicePlane from version 1.5.0 to 1.5.1 please follow these additional steps:
Open the ipconfig.php file with a text editor and remove the hash (#) in the first line so the first characters of the file are <?php.
Delete the following folder and its content as it's no longer needed: application/modules/setup/libraries
You can now disable the setup from your ipconfig.php file. To do so, copy DISABLE_SETUP=false to your ipconfig.php and change it to DISABLE_SETUP=true. You can remove the corresponding line from your .htaccess file if you want.
Because there are no additional tasks to do if you upgrade InvoicePlane from version 1.5.1 to 1.5.2
So it's the same from 1.5.2 to 1.5.3