Ive checked my installation I think my problem is different. The fact i can get to a preliminary light curve suggest the install is OK. When I type at the anaconda prompt: echo %PATH% the path includes C:Anaconda3. So im guessing that’s correct (It is the correct dir although not the one in the ARIEL notes, and python is there also). The problem I have in the work flow, is the FITTING routine. I get this message displayed for 1 second, then nothing. What does this imply?