Tekla Structures Dll registration for A&D

Problem:
In Tekla Structures 2018i Final version this error might appear at export of analysis model:

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There were warnings/errors in the model creation:
- Installed component errors

After clicking the Details button you see this:

ERROR: com-analysis.dll (OR com_api.dll) registration problem.

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Reason:
The system did not register the analysis dll-s at the installation of Tekla Structures.

Solution:
1. Open Command Prompt as administrator
    

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2. Go to the analysis folder <Tekla Structures installation folder>\nt\bin\analysis
    Type this:
    cd C:\Program Files\Tekla Structures\2018i\nt\bin\analysis
    Hit Enter
 
3. Register the dll-s:
    Type this:
    register_analysis.bat
    Hit Enter
 
Now the dll-s are registered, so you can start the export of the analysis model.


Unfortunately there is additional issue with unregister_analysis.reg file in 2018/2018i.
It has been fixed in 2018SP4. The correct files are attached, note that the file is different in each version. Please note that Windows 7 is not supported for this version.