Again, please follow the instructions in the workaround posting.
Not clear what navdata folder you deleted, but when you deleted the files in the community navdata folder, than this was wrong - you must delete the files in the work-navdata folder (see the path in point #5 of the instruction).
The PMDG addon should copy the files from the community-folder into this work-navdata folder (point #5), but that doesn´t work at the moment. It has nothing todo with us, that´s a bug in the PMDG which they are currently fixing.
The workaround is only that you can use the current cycle till it´s fixed by PMDG.
So, please, please, please … read the workaround posting carefully and try it step by step. As I have written it´s 100% working, when you do all steps correctly.
Cheers,
Richard