Hi,
You need to use SWPM 1.0 instead of SAP installation master. Please download the latest SWPM using the Note 1680045 - Release Note for Software Provisioning Manager 1.0
You can see the options that are available to install using SWPM is available in the below link.
Please use the below link to see the list of Media DVD's that are required for your ERP 6.0 with EHP6 installations.
Please open the link https://websmp210.sap-ag.de/erp-inst -> Select SAP enhancement packages for SAP ERP 6.0 -> SAP enhancement package 6 for SAP ERP 6.0 -> Media List for SAP enhancement package 6 for SAP ERP 6.0
Thanks and Regards,
Vimal