You're looking for information on downloading Simatic Net PC Software V15 in a portable format. Here's what I found:
OPC Server Integration: Every license includes an OPC Server (DA 2.05a), enabling third-party SCADA or HMI systems to access PLC tags easily. simatic net pc software v15 download portable
There is no official "portable" (no-install) version of SIMATIC NET V15 provided by Siemens. The software requires a standard installation process that often involves multiple system restarts to properly configure communication drivers and network stacks. Trial Download: You're looking for information on downloading Simatic Net
Version 15 is a sweet spot for many legacy and mid-range automation projects. It supports Windows 10 (LTSC 2019 and earlier), Windows Server 2016/2019, and is fully compatible with S7-1200, S7-1500, S7-300/400 series PLCs programmed with TIA Portal V15. Windows Server 2016/2019