Here're steps.
1.Download the Web Platform Installer then install it on another machine with internet access.
2.Run following commands as administrator on another machine with internet access to download Service Bus, Workflow Client and Workflow Manager Refresh for offline.
Webpicmd /offline /Products:ServiceBus /Path:E:\ServiceBus
Webpicmd /offline /Products:WorkflowClient /Path:E:\WorkflowClient
Webpicmd /offline /Products:WorkflowManagerRefresh /Path:E:\WorkflowManagerRefresh
Note: Modify E:\ with the path you would like to download to.
3.On another machine with internet access, download the Cumulative Update for Service Bus 1.0.
4.Copy downloaded files from Step 1, 2 and 3 to the server where you will install the Workflow Manager.
5.Run following command as administrator in the server where you will install the Workflow Manager.
WebpiCmd.exe /Install /Products:ServiceBus /XML:E:\ServiceBus\feeds\latest\webproductlist.xml
6.Manually install the file you downloaded from step 3.
7.Run following command as administrator in the server where you will install the Workflow Manager.
WebpiCmd.exe /Install /Products:WorkflowClient /XML:E:\WorkflowClient\feeds\latest\webproductlist.xml
8.Run following command as administrator in the server where you will install the Workflow Manager.
WebpiCmd.exe /Install /Products:WorkflowManagerRefresh /XML:E:\WorkflowManagerRefresh\feeds\latest\webproductlist.xml
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