Completely uninstall it (Vista: Control Panel->Programs and Features, XP: Control Panel->Add or Remove Programs) and then try reinstalling it. Reboot after uninstall and reboot after install, whether it asks you to or not.
I have the same issue, it was in the middle of an update and my computer restarted. After that it said:
"Curse Client v4 is not able to update itself to the latest version. The error is: The referenced assembly is not installed on your system.(Exception from HRESULT:0X800Y36BE) If you continue to receive this error, please uninstall this version, using the Windows Control Panel, then install the newest version from website."
I have tried to uninstall the program several times but it simply won't uninstall and if I try to just reinstall it I get the same error previously stated. So that leaves me completely stuck trying to get this to run sans a reformat/reinstall of OS. Also running win7 x64
Curse Client v4 is not able to update itself to the latest version. The error is:
The references assembly is not installed on your system. (Exception from HRESULT: 0x800736B3)
If you continue to receive this error, please uninstall this version, using the Windows Control Panel, then install the newest version from http://clientupdate.curse.com.
Would you like to go there now? When prompted, simply save then run Setup.exe (after uninstalling this version).
When I try to uninstall via the control panel a window pops up and quickly closes. So quickly I can't read it. The client still shows in the list of installed programs. I tried rebooting ... still same issue. So basically we can't update the client ... nor can we uninstall it. I fully recognize this is beta software ... though it appears you are no longer supporting/updating v3 which wouldn't be a big issue if v4 were somewhat stable.
I still cannot find where the client is installed. Is there a log file somewhere? Anyway, stuck in limbo at the moment.
Below is a summary of the errors, details of these errors are listed later in the log.
* Activation of http://clientupdate.curse.com/CurseClient.application resulted in exception. Following failure messages were detected:
+ The referenced assembly is not installed on your system. (Exception from HRESULT: 0x800736B3)
COMPONENT STORE TRANSACTION FAILURE SUMMARY
No transaction error was detected.
There were no warnings during this operation.