Dummy sampler is not present in JMeter version 4.0

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2 Answers
Every JMeter version you need to reinstall JMeter's PluginsManager
Download the Plugins Manager JAR file and put it into JMeter's lib/ext directory. Then start JMeter and go to "Options" menu to access the Plugins Manager.

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Dummy Sampler is not a part of JMeter bundle, it's being provided as a plugin. In order to transfer Dummy Sampler plugin from the previous JMeter installation you need to locate
jmeter-plugins-dummy-x.x.jar
file from thelib/ext
folder to thelib/ext
folder of the new JMeter installation. JMeter restart will be required to pick the plugin up.If you don't have access to the previous JMeter installation you can download the Dummy Sampler from JMeter Plugins website
Be aware that the recommended way of installing JMeter plugins and keeping them up to date is using JMeter Plugins Manager
And last but not the least, according to JMeter Best Practices you should always be using the latest version of JMeter so consider upgrading to JMeter 5.0 (or whatever the latest version is available at JMeter Downloads page) on next available opportunity.

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