Are you using the pro version?
If yes, contact WiseCleaner staff through the program.
If no, wait a reply here.
Or use the contact form here: https://www.wisecleaner.com/feedback.html
In the meanwhile, I have read the F.A.Q. and found the following:
When I open wise folder hider free, I cannot find my hidden files. Where are they? How can I get them back?
The hidden files are saved in your local disk, except you format disk.
Make sure you are using Wise Folder Hider v4, please try following steps to recover them:
Click here to download the recovery tool.
Open the recovery tool
Choose the drive you used to place the files hidden and continue opening up until you see the hidden file.
Right-click on the hidden file and choose 'Move to...'
Select a new place and save the file.
If you were using Wise Folder Hider v3 or early version, please contact the support team.