1. Run PowerOLAP as an Administrator

2. Open PowerOLAP and along the Home ribbon open Options

3. Towards the bottom left on the Options popup is a dropdown what what version of Excel PowerOLAP uses

4. Select the "Latest Installed" 

If you cannot run PowerOLAP as an Administrator 

1. Close PO Server/Client

2. Open up the registry 

3. Navigate to HKEY_CURRENT_USER\Software\Paris\PowerOLAP\Settings

4. Find the key named Language

5. Right click and choose Modify

6. Change Danish to English

7. Open PowerOLAP. Open a database first then check the Options. You should now see everything configured properly.