You can download the latest Standalone version of Attachments.expert from the below link
Standalone version of Attachments.expert is used when the storage server is Local Disk/SFTP or FTP.
Prerequisites:
Minimum Hardware
Pentium IV processor or equivalent
Internet connectivity required
Minimum Memory
2GB recommended for upto 20 Concurrent Users
4GB recommended for upto 40 Concurrent Users
Minimum Hard Disk Space
100 GB of free disk space
Operating System
Windows 2008 Server or above
Web Application Server
IIS 7.5 or above (except IIS 10) Please click here for more details on IIS 10 exception.
.NET Framework 4.6 and above.
Environment
Administrator rights to install the application