If free trial version of Stellar Data Recovery software is showing preview of a file, its paid version should definitely be able to recover the file.

However, this may happen if scan was performed with a different version of the software or different scanning options were used in demo version. There is no difference in the functionality of the demo and paid version as same software is activated with the activation key. 

If you are facing this kind of problem share with us screenshots of below:

- Preview of files in demo version of software.
- Preview window in paid version of software.

Our support team will look into the matter and get in touch with you to resolve the issue.