First, it complained about an old org.eclipse.core.runtime dependency.
I installed org.eclipse.core.runtime, and fixed that issue, and it still fails to install the plugin.
Cannot complete the install because one or more required items could not be found.
Software currently installed: Freescale MQX support for ARM DS-5 22.214.171.124307020935 (com.freescale.mqx.ds5.feature.group 126.96.36.199307020935)
Missing requirement: MQX Configuration Editor 188.8.131.52307020935 (com.freescale.mqx.configuration.editor 184.108.40.206307020935) requires 'bundle org.eclipse.core.runtime [3.7.0,3.8.0)' but it could not be found
Cannot satisfy dependency:
From: Freescale MQX support for ARM DS-5 220.127.116.11307020935 (com.freescale.mqx.ds5.feature.group 18.104.22.168307020935)
To: com.freescale.mqx.configuration.editor [22.214.171.124307020935]
i cannot find any (com.freescale.mqx.configuration.editor) install site or download
using 4.1 w/ patch 126.96.36.199