EO Traveller licence

All the information should be found on the web site, but in short no you shouldn't need a second license and you can have it install onto multiple devices .
The only time you should need a second license is if you want a licence for Androids and another for Apple is my understanding

Yes as Nick says, use the Traveller Web App - to do this:-
1. You need a Member account (or Pro Acccess)
2. Open the ExplorOz website https://www.exploroz.com (what you’re on now)
3. At the top click PRODUCTS - select Traveller Web App from the drop down. This wont be visible if arent logged in with Member benefits.
4. The Web app doesn't offer tracking - its designed for stationery use for browsing/trip planning. You have full access to your account for Personal Places, Routes, Notes, Folders, Track logs etc using all trip planning tools Members have unlimited viewing of online EOTopo maps in the web app so you dont download or use offline maps in the web app. When you plan trips in the web app it is saved to your account so when you use the Traveller app on your phone/tablet/headunit etc changes are auto sync to that device (open those devices online for synching).