regularuser
I've installed (and re-installed few minutes ago) those files:
t4-builder-article-intergration-plg_2.0.3.zip
t4_blank_tpl_1.1.4.zip
t4_pagebuilder_component_2.0.4.zip
t4-page-builder-plugin_1.1.0.zip
t4-system-plugin_2.2.3.zip
and ri-enabled Content - T4 Page Builder, Editors-xtd - T4 Page Builder, T4 System in Extensions-Plugins
then I found the folder of that post and updated button.js..
but nothing changed