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-5 126.96.36.199307020935 (com.freescale.mqx.ds5.feature.group 188.8.131.52307020935)
Missing requirement: MQX Configuration Editor 184.108.40.206307020935 (com.freescale.mqx.configuration.editor 220.127.116.11307020935) 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 18.104.22.168307020935 (com.freescale.mqx.ds5.feature.group 22.214.171.124307020935)
To: com.freescale.mqx.configuration.editor [126.96.36.199307020935]
i cannot find any (com.freescale.mqx.configuration.editor) install site or download
using 4.1 w/ patch 188.8.131.52