Step 1: Open your IDE and click on Help » Install New Software…
Step 2: Click on the Add button and fill the details like Name: Activiti Designer (you can choose any name) Location: https://www.activiti.org/designer/update/ and then hit the OK button.
Finally proceed with next, next…, if it is able to load the contents.
If the above method did not work,
Step 1: Download zip from http://www.activiti.org/designer/archived/activiti-designer-5.18.0.zip
Step 2: Open your IDE and click on Help » Install New Software…
Step 3: Click on the Add button and fill the details like Name: Activiti Designer (you can choose any name) Location: [path/to/your/downloaded/zip/file] and then hit the OK button.
