I encountered that error after installing the software for a family member. I had installed the software under an administrator account, but when I was later testing the software under her account I saw that error message appear frequently. You can remedy the problem by copying fhe folder from the account under which it was installed to another account where you wish to use the software.

You can do that In Windows 8 while logged into a non-privileged account, i.e., one that isn't in the administrator group, by right-clicking on the Start button, then choosing Command Prompt (Admin) and providing a userid and password for an account that is in the administrator group. E.g., in this case I provided the credentials for the account under which I installed the software, since it was an account in the administrator group.

You can find the Markup directory beneath C:\Users\userid\AppData\Roaming\CoffeeCup Software\CoffeeCup HTML Editor\Markup where userid is the user name for the account under which you installed the CoffeCup HTML Editor. E.g., supposing the userid was JDoe, I would see the following:

 Volume in drive C has no label.
 Volume Serial Number is 5C60-1B61

 Directory of C:\Users\JDoe\AppData\Roaming\CoffeeCup Software\CoffeeCup HTML Editor\Markup

06/12/2015  12:51 PM    <DIR>          .
06/12/2015  12:51 PM    <DIR>          ..
06/12/2015  12:51 PM    <DIR>          CSS2.1
06/12/2015  12:51 PM    <DIR>          CSS3
06/24/2010  11:44 AM             3,055 doctypes.txt
06/12/2015  12:51 PM    <DIR>          Entities
06/12/2015  12:51 PM    <DIR>          HTML
03/12/2014  09:45 AM            22,830 html-entities.conf
06/12/2015  12:51 PM    <DIR>          HTML4.01
06/12/2015  12:51 PM    <DIR>          HTML5
06/12/2015  12:51 PM    <DIR>          Markdown
03/06/2014  09:43 AM            70,692 opengraph.dat
12/16/2013  08:22 AM           944,004 schema.dat
06/12/2015  12:51 PM    <DIR>          XHTML1
06/28/2010  02:17 PM                93 _default.css
               5 File(s)      1,040,674 bytes
              10 Dir(s)  3,738,071,187,456 bytes free

From an admin command prompt, I could then copy the contents to a similar location under another account where I want to be able to use the software. E.g., supposing I wanted to copy from the JDoe account to a Jane account, I could use the xcopy command below.

xcopy /s "C:\Users\JDoe\AppData\Roaming\CoffeeCup Software\CoffeeCup HTML Editor" "C:\Users\Jane\AppData\Roaming\CoffeeCup Software\CoffeeCup HTML Editor\."

There are over 800 files in the folder and its subfolders. Once they are copied, if you had the HTML Editor open during that process, close and reopen it.

I also encountered a problem while configuring the HTML Editor to display files in browsers on the system, which gives you the opportunity to see what a page will look like in multiple browsers. That problem was also related to directory permissions, since the CoffeeCup HTML Editor was attempting to create files in a directory where only accounts in the administrator group should be able to create files - see Configuring CoffeCup HTML Editor for browser support.

References:

1. "Markup Data Folder Does Not Exist" Error
   By: Scott Swedorski
   Date: June 6, 2013
   HTML Editor, Website & Web Design Software | CoffeeCup Software

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