I keep getting this error for Studio 2017, despite running as admin 

C:\ProgramData\SDL\SDL Trados Studio\Studio5\Updates\StudioUpdateClient.exe

and disabling Avast Antivirus. Log:

[02/21/2018 17:06:25] Success Update started: C:\ProgramData\SDL\SDL Trados Studio\Studio5\Updates\StudioUpdateClient.exe
[02/21/2018 17:06:25] Notice Update engine version: 3.5.2.0
[02/21/2018 17:06:25] Notice Product: SDL Trados Studio
[02/21/2018 17:06:25] Success Language set: Primary = 8, Secondary = 1
[02/21/2018 17:06:25] Success Load plugin: C:\Users\spiros\AppData\Local\Temp\_ir_tu2_temp_0\LuaCOM.lmd
[02/21/2018 17:06:25] Success Load plugin: C:\Users\spiros\AppData\Local\Temp\_ir_tu2_temp_0\AutoupdateExtensions.lmd
[02/21/2018 17:06:25] Success Include script: _TU20_Global_Functions.lua
[02/21/2018 17:06:25] Success Include script: ClientServerCommon.lua
[02/21/2018 17:06:25] Success Include script: LanguageStringsCP1252.lua
[02/21/2018 17:06:25] Success Include script: LanguageStringsGB2312.lua
[02/21/2018 17:06:25] Success Include script: LanguageStringsSHIFT-JIS.lua
[02/21/2018 17:06:25] Success Include script: LanguageStringsCP949.lua
[02/21/2018 17:06:25] Success Include script: LanguageStringsCP1251.lua
[2018/02/21 15:06:26] Available Language strings: 12,1; 25,1; 7,1; 16,1; 4,2; 18,1; 10,1; 9,2; 17,1;
[2018/02/21 15:06:26] System Language: 9 1
[02/21/2018 17:06:26] Error Script: Client Script, [494]: local ProductLanguageSetting = Registry.GetValue(HKEY_CURRENT_USER, PRODUCTLANGUAGEKEY, PRODUCTLANGUAGEVALUE, false); (1605)
[2018/02/21 15:06:26] Failed to read product language from registry
[2018/02/21 15:06:26] Update Language: 9 2
[02/21/2018 17:06:26] Success Display screen: Download Server Script
[02/21/2018 17:06:26] Success Language set: Primary = 9, Secondary = 1
[02/21/2018 17:06:26] Notice Automatic update required.
[02/21/2018 17:06:29] Notice Restarting update executable: 'C:\ProgramData\SDL\SDL Trados Studio\Studio5\Updates\studio5.ts3'
[02/21/2018 17:06:29] Success Run client data event: Client Script
[02/21/2018 17:06:29] Notice Exit update process (Return code: 10)