Syncing Logic and Sibelius without Rewire

Have you tried to boot both applications in Rosetta Mode?

edit: you could "Add a Video" in Sibelius. This can be an audio file as well. As long as your audio doesn't have tempo changes, this might be the most convenient way to go. I have to admit, I haven't synced Sibelius and Logic since the development of Rewire was terminated.

"Add a Video" in Sibelius requires you have to bounce your audio in Logic, the add the audio into sibelius.

How is your working process with Logic and Sibelius? I've used Sibelius to write scores to hand them over to real musicians. I didn't care much about how it sounds.

do you have to download an APP?

What do you mean by that?