Older versions, for example 1.275, can be downloaded with following links:

www.eap-pt2020.at/pt2020_download/archiv/1.275/EAP-PT2020-Studio-Setup.exe
www.eap-pt2020.at/pt2020_download/archiv/1.275/EAP-PT2020-App-Setup.exe
www.eap-pt2020.at/pt2020_download/archiv/1.275/pt2020rt.bin

                                ATTENTION! 
Version number of Studio must fit to Runtime to avoid compatibility problems.