From Sigma:
Sigma Optimization Pro 1.1:
Even after the update of lens firmware, this updated version of software will allow customers to secure all the settings and adjustment values of AF and OS that are customized via the USB DOCK. Please update to Ver1.1 before operating firmware update of 17-70mm F2.8-4 DC MACRO OS HSM C013 and 35mm F1.4 DG HSM A012. When the latest version of SIGMA Optimization Pro is released, users of the previous version will be notified with a pop-up window when the software starts up with an internet connection.
Download: Sigma Optimization Pro 1.1: Windows | Macintosh
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Sigma 35mm f/1.4 DG HSM Firmware 1.02:
* Please update to SIGMA Optimization Pro Ver1.1 before operating firmware update of 35mm F1.4 DG HSM A012.
You can download the Sigma 35mm f/1.4 DG HSM Firmware 1.02 via Optimization Pro 1.1.
Sigma 17-70mm F2.8-4 DC Macro OS HSM Firmware 1.01:
* Please update to SIGMA Optimization Pro Ver1.1 before operating firmware update of 17-70mm F2.8-4 DC MACRO OS HSM C013.
You can download the Sigma 17-70mm F2.8-4 DC Macro OS HSM Firmware 1.01 via Optimization Pro 1.1.
Adorama carries the Sigma 35mm f/1.4 DG HSM, Sigma 17-70mm F2.8-4 DC Macro OS HSM and the USB Dock.