Update button in AAM ist not visible

Installations with AAM (Version 6.2)aredone, but Updates are not available because the button ist not visible.

the DLM_Native.log shows this error:

[INFO] |  |  |  |  |  |  | 1356 | Update Session is created and key generated is {0C3B216B-CDCF-4DC3-87D0-1C220787ABED}

[INFO] |  |  |  |  |  |  | 1356 | Product Session is created and key generated is {73E75BBB-54CD-43C0-B2F5-F3FBFB0BE67A}

[WARN] |  |  |  |  |  |  | 1356 | Could not initialize CCM config sig file as XML data

[INFO] |  |  |  |  |  |  | 2612 | Failed to open event handle

[WARN] |  |  |  |  | UCErrorHandling |  | 2612 | UCInitialize returned ErrorCode : 23

[ERROR] |  |  |  |  | DLMNative |  | 2612 | Error occured in initializing updater. Error code: 23

[INFO] | {0C3B216B-CDCF-4DC3-87D0-1C220787ABED} |  |  |  |  |  | 136 | No need to update AAM

System: Win_XP, 32-Bit