The firmware release is available from our main website using the link below:-
Firmware ALIF1002R & ALIF1002T v5.1.52546
Firmware ALIF2000R, ALIF2000T, ALIF2002T v5.1.52546 
Firmware ALIF2020R, ALIF2020T v5.1.52546 
Firmware ALIF2112T v5.1.52546 


This firmware release may have been superseded and no longer available for download.   Always check to make sure that you are running the latest firmware version.  The version was correct at the time of writing this article.