I’ve been using a script for drizzle of Seestar images (no calibration frames) in Siril ver. 1.2 but it doesn’t work in ver. 1.4 beta. See video at https://www.youtube.com/watch?v=ioX84YCbIs8&t=1123s and get script AstroBBQ_StackLightsRelaxedDrizzled.ssf at C:\Program Files\Siril\Siril Custom Scripts.
In ver. 1.4, this gives “Error in line 30 (‘register’): invalid arguments.”