Go Pro HD
 

When shooting in 720p at 50 fps [slomo PAL] there is no preset in HD Link like there is for 60 fps to make it slomo.

HD Link crashes when trying to use from 60 to 3o fps.
As a workaround I use interpret footage in CS5.

Is it possible to add a preset for PAL to make 50 fps to 25 fps?

TIA

60 to 30 is the same as 50 to 25, is only instructs the conversion to do a 50% slow down, source frame rate doesn't matter. As it doesn't crash in testing here, please file a trouble ticket with support.