ASC files not verifying Windows pgAdmin 4 installers

To Whom It May Concern:

I tried to download pgAdmin 4.18 and 4.19 for Windows, but I cannot use the corresponding asc files posted at https://www.postgresql.org/ftp/pgadmin/pgadmin4/v4.18/windows/ or at https://www.postgresql.org/ftp/pgadmin/pgadmin4/v4.19/windows/ to verify the installers.  What must be done to allow for verifying the installers?

Thank you for your assistance.