Click on Windows Explorer (in Windows 10, File Explorer), that icon usually near the Start icon. Navigate down to the directory in which MarpX Privacy was installed. Suppose you installed on Drive C: and left the default location as it was: C:\Program Files (x86)\Marpex Inc\MarpxPrivacy. Click your way down through that series until the MarpxPrivacy directory shows. Highlight it as in this screen shot:
Right click on the highlighted line.
Click on the Security tab.
Select the line for users in the top box, and you see this:
Notice that there is no check mark beside the word Write. Our aim is to ensure that users have the ability to write to this directory. Therefore click on the Edit button.
There is now an empty box to the left of "Write". Click on that box. Now click on OK and you are returned to the dirctory. When the MarpxPrivacy program is run, it will now have the necessary permission to write temporary files.
Click the X in the upper right corner to leave the "verify write permission" step.