One Reddit user @u/Extraccount-13posted that he had lost 2+ years of edits after updating the Lightroom app.
Adobe is unbelievable some times.
All I got was a were sincerely sorry and nothing else.
Adobe acknowledged the issue through a forum post on Thursday and apologized for the error.
Installing version 5.4.1 will not restore missing photos or presets for customers affected by the problem introduced in 5.4.0.
We know that some customers have photos and presets that are not recoverable.
We know how frustrating and upsetting this will be to people affected and we sincerely apologize.
If you are affected by this issue, hey refer to the information in ourforum.
Adobe also clarified that no assets in the Lightroom cloud were lost or are at risk.
source: www.techworm.net