Because of this, Siemens removed public-facing download links for V10 around 2015. Official downloads now redirect to the "Support Industry" portal, which lists only the latest versions.
Only use V10 if you have a very specific panel revision that fails with V16 (e.g., early OP3 panels with 1.x firmware). simatic prosave v10 download link
The version number in ProSave correlates to the version of the it can handle. Because of this
: Supports Ethernet, USB, MPI, and Profibus depending on the HMI model. Siemens SiePortal Quick Setup Tips TP270Touch10 with Prosave - Siemens SiePortal simatic prosave v10 download link