Was not able to sync my wallet properly around 2 weeks ago (5 weeks behind). Eventually managed to sync with 1 active user yesterday, phew!!
Tried to upgrade to latest dash core wallet software, but told 'fatal error' had occurred.
Any advice please?
Of course I am, haven't checked this side for a while but decided to answer anyway :)
We keep your issue on support desk though.
It didn't solve the problem, but thanks anyway!
PS: You know this question is from 15 days ago right?
As I have already suggested you, the removal of the appdata folder except wallet.dat and backups folder and starting the v14.0.2 should solve your issue.