1.    Stop Olation service

2.    Close Olation and Excel

3.    Check if you are running a x32 or x64 version

Go to task manager, on the details tab right click and select columns

Choose platform and click ok

4.    Open command prompt and run as administrator (Windows key, type cmd)

5.    In command prompt 

For x64 enter : 

regsvr32 "C:\Program Files\Olation\OlationCom.dll"

For x32 enter : 

regsvr32 “C:\Program Files (x86)\Olation\OlationCom.dll” 

6.    Then press enter

You will get a message that it has been succeeded.