Although the extension of that file is .arc, it's not a zip file. After you download the file, please put that file into your ConfigMaster/NMS/Configuration folder (ConfigMaster at C: directory, and EWS at C:\Program Files directory), and select that file in the "Update Software" window. To work with this version, ConfigMaster version is 8.426. To work with this version, EWS (Embedded Web Server) version is 8.426. From 3.131 to 3.135 changes: New Feature: 1. VRRP support 2. ICMP filtering on QoS Fixed: 1. Hangup problem at IP scan (eg, Welchia Virus) environment. 2. Long ping delay every 7 pings problem. 3. Aggregate VLAN problem at tagged port. Although the extension of that file is .arc, it's not a zip file. After you download the file, please put that file into your ConfigMaster/NMS/Configuration folder (ConfigMaster at C: directory, and EWS at C:\Program Files directory), and select that file in the "Update Software" window. To work with this version, ConfigMaster version is 8.426. To work with this version, EWS (Embedded Web Server) version is 8.426. From 3.131 to 3.135 changes: New Feature: 1. VRRP support 2. ICMP filtering on QoS Fixed: 1. Hangup problem at IP scan (eg, Welchia Virus) environment. 2. Long ping delay every 7 pings problem. 3. Aggregate VLAN problem at tagged port.