No VPN client file available for download

Hello.

I have launched the EMS server.
Test users are logging in and everything is OK.
The problem is as follows: after preparing the VPN client distribution, the system sends an email
to recipients inviting them to download the client and register in EMS.

The issue is that when clicking the link to download ie. Windows FC  [https://myserver.com/installers/default/VPN-Client/FortiClientSetup_7.4.4_x64.exe] 
the page displays Not Found. The requested resource was not found on this server.

The registration link works, the client retrieves the settings and registers in EMS.

The problem occurs even in Deployment & Installers. When clicking the download link, it does not download but instead shows the message: Not Found . The requested resource was not found on this server.

What should be done to enable the download?

Thank you for your help.