I can not start the mission 'Now or Never'. I believe it is due to the Travel From Anywhere mod. Does anyone know how to fix this issue?
No, there is no fix for this quest. You fast traveled out of Dijkstra's place I'm assuming.
The quest marker is at the entrance when you are leaving Dijkstra's pool palace. Once you leave this area by fast traveling, there is no way to start the quest again.
There is no issue story wise, if you don't mind not sleeping with Triss (best girl next to Shani). Once you start the main quest and go forward, she'll meet you at Kaer Morhen like nothing ever happened.
Nothing too breaking, you just miss out on the romance opportunity and a little escort mission.
Enable the debug console: (I did not make this mod. It's linked to in the nexus forums as v1.12 broke the console enabler found in the Nexus DB.)
Then type these three commands separately.
I tried to do this at various points throughout my save files and it never worked for me.