Hi there, Martin! Thanks for getting in touch and welcome to the forums. 🙂
The good news is that you can get a direct download of PRO 3.8.1 from your account here on this site. Just log in and head over to the Downloads section and you’ll be able to grab the latest release from right there.
Having the update disappear like that is certainly odd. I wasn’t able to replicate it myself, but please keep an eye on it and let us know if it continues to happen. I’ll certainly be watching to see if any other issues like that pop up as well.
Will this work for you? Please let me know. 🙂
Cheers!
Geoff