I tried following the instructions on how to download but it isn't working. I've tried at least 7 times now to download it but it only comes up with a heap of files. I have also been trying to do the online one and it has been working fine for a while but for the past couple of days, when I try to run it, it does the blue screen and then it turns black and stays black until I finally decide to just close it.
The online one isn't as up to date as the downloadable one, so the problems you are experiencing with the online one are understandable. In the downloadable folder, the Clangen icon is very hard to differ from the other files so make sure you're looking for the Clangen.exe file. (I tried to upload a picture of the icon into this reply but I couldn't get it to work, sorry)
I have only downloaded the Clangen_Win64.zip file so if you are downloading a different file then it might be different, but I don't think it would be. You could try searching ".exe" in the search bar while the "Clangen" folder is open so that you can find it easier. If it is not there then idk what happened. Hope this helps :)