You can. Simply use {pro} and {contra} in your texts to show the vote number.

Important are the PHP version and the plugin version. You can check the settings of the plugin. In the sidebar you will find what you are looking for.

I’m afraid not. I have not dealt with it and only know that there are problems with Javascript. If you have a solution, you are welcome to share it in the forum.

For the code editor you need at least version 4.9 of WordPress. Without this version, a text field will be displayed instead of the editor. The editor is used for custom CSS.

You can. Choose theme as theme in the helpful options. Then create an helpful folder and an theme.css file in it. Fill the theme.css file with your CSS and you’re done.

You’re welcome to do that. The plugin on Codecanyon is a good plugin, with probably much more features. I program the plugin in my spare time and don’t want to earn any money with it. I think it’s good as it is.

First you have to activate the Metabox in the Helpful settings. Once you have done this, a box will appear below the posts (in the admin area) where you can reset the post.

You can. Use {author} for it in your texts. The display_name of the author will then be used.

Go to Design in the Helpful settings, or visit your WordPress Customizer. There you will find a Helpful menu item.

Switch to the Helpful settings and click on the System tab. There you will find the item Maintenance. Perform the maintenance once. Helpful will do the rest for you.