Having the same problem, here's the relevant portion of my PatchClient.log:
Code:
000000011.394: Trying to apply iteration <client_map_1.dat-43168>. error 0x81930003
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39351> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39351>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39352> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39352>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39353> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39353>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39354> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39354>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39355> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39355>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39356> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39356>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39357> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39357>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39358> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39358>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39359> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39359>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39360> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39360>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39361> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39361>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39362> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39362>
000000011.394: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39364> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39364>
000000011.483: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39365> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39365>
000000011.483: Data patching failed with error 0x81930003
000000011.483: Queueing download of <http://akamai.ddo.com/ddo/patch/iterations/client_map_2.dat-39366> to <D:\Dungeons & Dragons Online\forward/client_map_2.dat-39366>
000000011.483: ----CRASH REPORT START----
000000011.483: Program fault: ACCESS_VIOLATION (0xc0000005) trying to write to 0xFFFFFFFF
000000011.483: Detailed report:
Current local time: Fri Oct 15 20:26:46 2021
Version Report generated by CoreVersion : 2.0.143.1 (0x0200008F):
Language: English (United States)
CompanyName : Standing Stone Games, LLC.
FileDescription :
FileVersion : 5000.0050.2069.4017
InternalName : dndLauncher
LegalCopyright : Copyright © 2016-2021 Standing Stone Games, LLC.
OriginalFilename : dndLauncher.exe
ProductName : dndLauncher
ProductVersion : 5000.0050.2069.4017 dnd
Comments : compiled Sun Oct 10 16:17:42 2021 : NoBuildMode
TurbineBuildVersion : 5000.0050.2069.4017.NoBuildMode
TurbineType : Admin Internal
000000011.483: ----CRASH REPORT END----