Replacement for Jenkins Scriptler plugin?
Hi you can store your groovy scripts in Managed Files and pass the parameters to groovy script through Extended Choice Parameters Plugin.
Or else you can download Scriptler plugin source code and add it to your /var/lib/jenkins/plugin folder and start Jenkins server. It will work fine.
For removed plugins: You can find the .hpi file on archive sites on the internet, and then in Jenkins in Manage Plugins, use the "Advanced" tab > "Upload Plugin" to install it.