How to Install the Force.com IDE Plug-In in Eclipse.

Install the Force.com IDE Plug-In

Step 1: Launch Eclipse.

Step 2: Select Help → Install New Software.

Step 3:  Click Add button and write in the Add Repository dialog box,

           Name → Force.com IDE

     Location → https://developer.salesforce.com/media/force-ide/eclipse45

→ For Spring ’16 (Force.com IDE v36.0) and earlier Force.com IDE versions, use http://media.developerforce.com/force-ide/eclipse42.

→ Click OK.

→ To install an older version of the plug-in (for example, if you don’t have Java 8), deselect Show only the latest versions of available software.

→ Eclipse downloads the list of available plug-ins and displays them in the Available Software dialog.

Step 4:  Select the Force.com IDE plug-in, and then click Next.

Step 5:  In the Install Details dialog, click Next.

Step 6:  In the Review Licenses dialog, accept the terms and click Finish.

→ In step 4, If you choose to install support for Lightning components, Eclipse displays a warning dialog about installing software that contains unsigned content. We are bundling third-party plug-ins to support Lightning components. Salesforce doesn’t own these third-party plug-ins; hence, we don’t sign them. Click OK to proceed.

→ Eclipse downloads and installs the Force.com IDE and the required dependencies. When the installation is complete, you are prompted to restart. Click Yes.

→ When Eclipse restarts, select Window → Open Perspective → Other. Select Force.com and then click OK.

→ You are now ready to develop and customize Force.com applications in Eclipse!