V2017.5 Benz Software Error "No more updates can be installed on the diagnostic system" and Solution

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When diagnose 2012 E550 4matic via our 2017.5 SDC4 software, if you meet the following error message:

Caution!
No more updates can be installed on the diagnostic system.
The following functions are not available:

Initial startup
SCN coding
Control unit update

Please just find the following path for kontext, then replace it:
C:\ Program Files(x86)\ Mercedes-Benz \ Xentry \ Kontexte

Kontext link: https://mega.nz/#!oRYBkYoT
Password: !Nx-0piFHVl0Y02e2AceFgez0yTGeb8WR3QJ5JBIeTME