Using two synced systems: "The output style specified is not available..." - but it is!

Thank you for your fast answer. The 4 steps mentioned by you aswell as mentioned in the Endnote Support Instructions are exactly what I’ve tried several times. For some reason, it did not work at all.

Another method I’ve tried was to reinstall Endnote, put the .ens-file into the preferred style folder and open Endnote, then activate the style through the style manager. Again, this didn’t work at all.

Both systems, as well as the document use the style imported through the 4 steps as their active style. Still, I’ll get this error. And I don’t have any clue, why.

Any ideas left?

Regarding the backup methods, thanks for the hint. I already store my thesis on several spots in order to keep my data redundant, but haven’t thought of saving one using temporary citations. I’ll do so, soon.