Hi again Gulshan,
If I understood correctly your question, I checked the properties of the folder you mentioned. There are write permissions for SYSTEM, User (my name) and Administrators. For your further information, I noticed in there a new subfolder, named ".wifisync", which contains two other folders: ".certs" and "info". I had tried several times to delete it and restart Enpass and Wi-Fi sync. ".wifisync" with its subfolders are recreated, but ".certs" remains always empty. The "info" contains a json file.
As for your suggestion, I was using the Store version. I uninstalled it and installed the website one. The Enpass version is now 6.7.0 (867), but the issue persists.