S1TBX-1.0.3 1.0 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular version among S1TBX-1.0.3 users is 1.0. S1TBX-1.0.3 lies within System Utilities, more precisely Device Assistants.
This free PC software can be installed on Windows 7/8/10/11 environment, 64-bit version. The actual developer of the free program is ESA. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software.
From the developer:
The SENTINEL-1 Toolbox (S1TBX) consists of a collection of processing tools, data product readers and writers and a display/analysis application to support the large archive of data from ESA SAR missions including SENTINEL-1, ERS-1 & 2 and ENVISAT, as well as third party SAR data from ALOS PALSAR, TerraSAR-X, COSMO-SkyMed and RADARSAT-2.
You may want to check out more software, such as Right PDF printer or iPHUC for Windows, which might be related to S1TBX-1.0.3.