PreForm 2_14_0: http://www.mediafire.com/file/llgh2b0e37dnrzs/PreForm_2_14_0.exe December 2017.
PreForm 2_14_1: http://www.mediafire.com/file/uv8u288810sj78r/PreForm_2_14_1.exe January 2018.
PreForm 2_15_0: http://www.mediafire.com/file/qwc1iu22u54uljf/PreForm_2_15_0.exe February 2018.
I’ve opened a “Firmware older versions” thread. Sorry they start only from 1.14.21 for the Form2. Hope that in a future it will be more useful.