Dell Latitude E7440.
Just finally installed 1903 update.
It helped me to delete Dell Encryption and Dell Data Security.
Go to C:\Program Files (x86)\Dell\Dell Data Protection and uninstall it all with Run as Administrator.
Then restart.
Next simply go into Windows Update panel and install.
P.S. Also don't forget to delete all files into C:\Windows\SoftwareDistribution folder (i don't know exactly if it's needed, but I've deleted it couple weeks ago).
Profit!