If you have Encore 5, export as MusicXML. If you don't, find somebody who can do it for you.

You have three choices:

Export as MusicXML. Encore 5 for Windows supports some of the features of xml 1.1. Notes and some text only. Expressions and lyrics will not export.

If you have a printout, use something like SmartScore 64 Pro to scan it in. Finale owners can get it for 50% off and there’s a 30 day demo available from Musitek. 

https://www.musitek.com/store/Fin2SS64.html 

Wait for Encore 6. It was supposed to be ready a few months ago but hasn’t shipped. Don Williams has told me that Overture 6, when released, will also be able to open Encore 5 files. In both cases, the new apps will be able to export MusicXML 3.0 which should get everything. 

https://passportmusic.com/forum/community/