Step 1:
Open Google Chrome Settings, click on Downloads
On the Downloads section:
+ Location: change the download location to a folder where you will store exported questions' files.
+ Ask where to save each file before downloading: click the button to turn off
Step 2:
Go to your Confluence Data Center/Server administration page.
On the left navigator, at Questions & Answers section, click Migrations to open Questions & Answers Exporter page. On this page, click Download to export questions & answers' files to the folder configurated in step 1.
