I put the part in bold that explains why this file won’t work for you if you have no OS installed.
Here is what you should do:
- get an SD card if you don’t have any
- download the following files from here
- FP2 - Update file of Fairphone OS 1.13.0 (~600MB)
- FP2 - Update file of Fairphone OS 18.02.0 from 1.13.0 (Android 5.1) (~500MB)
FP2 - Update file of Fairphone OS 18.02.0 from 18.01.1 (~50MB)
- and put them on your SD card
- boot into TWRP and flash those files in the right order without rebooting in between (since you just bought the FP2 it has a new screen and the new screen doesn’t work with older OS versions, so only boot to system once you are on a recent version)
- (optional) wait for an update to Sailfish as it doesn’t work with the new screen either (yet)
- (optional) once this has been fixed try again, with help from the forum.