You're looking for information on downloading WinCC 7.0 SP3 Update 1. Here's what I found:
Bug Fixes: Resolution of known issues in the Graphics Designer and Global Scripting editors. System Requirements Wincc 7.0 Sp3 Update 1 Download
Direct downloads for legacy versions like WinCC V7.0 are typically hosted on the Siemens SiePortal (Industry Online Support). You're looking for information on downloading WinCC 7
To obtain this specific software version and its updates, you should use the following official channels: [ ] Verify OS is Windows 7 or Server 2008
Service Pack 3 (SP3) was a major milestone for version 7.0, introducing broader support for Windows 7 and Windows Server 2008. Update 1 is a cumulative patch designed to fix bugs, improve stability, and address security vulnerabilities found in the base SP3 release. Key Features and Improvements
Backup Your Project: Always create a full backup of your .mcp files and databases before applying updates.