Comment on Massive Passive Profits Autoblog Plugin by SEO Dave.
You have to upload the Massive Passive Profits Autoblog Plugin files to each domain separately and on the first domain it’s not even on the server so there is no way to activate a plugin not physically uploaded to the server, which is why on the site you tried to run Stallion 6 on doesn’t have MPP available to activate.
Basically you’ve uploaded the plugin files to domain 2 and not to domain 1.
I’m not the author of the Autoblog plugin so no clue why it would not uninstall on domain 2. If a plugin breaks you can deactivate it by physically removing it from the server. To do this you would delete or move this folder /wp-content/plugins/wp-mpp/ using FTP. When the files are not found WordPress will deactivate the plugin.