Create a folder on a large external drive or server with at least 200 GB free space. Example:

D:\SAP_Downloads\ECC_EHP7\

Navigate to the extracted DVD folder → SWPMsapinst.exe (Windows) or sapinst (Linux).

You need to check at least these boxes:

Critical: Some export files are distributed as multiple .RAR or .SAR volumes. Download all parts.

Cause: Firewall blocking internal ports (32xx, 33xx, 48xx).
Fix: Disable Windows Firewall or Linux iptables temporarily during install.