the email message you received after purchasing the certificate- this message contains a link to a Web page where you can download the required software and certificateġ) Downloading and installing the token software.an iKey 5100 token (provided by Entrust).a supported operating system (see “Supported operating systems” on page 5).a supported browser with Internet access.To install and use your Entrust certificate you require: Microsoft Windows 7 (32-bit and 64-bit).Microsoft Windows Server 2008 SP2 (32-bit).Microsoft Windows Server 2008 R2 SP1 (64-bit).The following operating systems are supported by Entrust Document Signing certificates: How to install an Entrust Document Signing Certificate