@yacc143: I’ve fixed the link. Fun fact, the link was wrong also in the announcement of Paperwork 1.3.0 
(World/ was missing in the path ; yeah, I copied-pasted).
Regarding compatibility, that’s a very good question. The work directory layout is compatible, but one way only:
- 1.3 --> 2.0: Compatible. No issues expected.
- 2.0 --> 1.3: Not compatible. Any page post-processing or editing will not be visible anymore. PDF editions won’t be visible either. You may end up having issues due to the files
page_maps.csvandpaper.X.edited.jpegnot being taken into account by Paperwork 1.3.
Details are available on the wiki (see the parts marked “Paperwork >= 2.0 only”).
In any case, I would advise making backups of your work directory before updating (actually I would always advise backuping everything … )