You could see if the TET website is up and running to download the route.
If you have problems, let me know as I have a copy.
Better off checking the Facebook page
I'm an iPhone user, which is shame as the TET App is only for Android and looks great. Might have to buy an Android phone .
https://transeurotrail.org/
All downloadable here, no app required. The TET team ask that you don’t share the gpx files, either with each other or via ViewRanger or WikiLocs or the like, and download it for your trip as it constantly changes.
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I use an iPhone. I download the GPX, convert it to KML and then save it in Maps.me to follow the route.
Interesting! I'll look into this. Do you mind if I PM you for more advice if necessary?