Hi…,
Welcome
Please see the FAQ - Out of Date noting para 3 re not starting with a FS situation or saved flight with date outside the AIRAC date range.
If still an issue, In FMS Data Manager Settings page, you can see the version you are running. It should read
If not please download and install FMS Data Manager
Also in Settings check your P3D v5 path is correct.
Cheers
Ian