How to Bulk Move Posts to Categories and Tags in WordPress

How To Bulk Move WordPress Posts to Categories and Tags
Surprisingly enough bulk moving WordPress posts to categories can be done in the back end of your WordPress website. That being said, unless I am mistaken, you cannot bulk move WordPress posts to tags without the use of a plugin or code. You can add or delete tags, but not bulk move.
How to Create a New Category and Move a Post to a Different Category in WordPress
Keeping your content organized makes your site look more professional and easier to operate. You want visitors to have the most fluid and superior user experience possible. Keeping your posts in a logical hierarchy only works to improve this, which may lead to a better experience and a higher likelihood visitors will come back.
How to Move Multiple WordPress Posts to a New Category
Once you’ve had your site for a while, it’s only normal for it to grow and change. Over time you might decide that you want to expand the topics you cover. Or you might decide just the opposite – to narrow your niche and drill down on specific areas.
WordPress.org
If for some reason the above method doesn’t work then you can download the plugin as a zip file, extract it and then use your favorite FTP client and then upload the contents of the zip file to the wp-content/plugins/ directory of your WordPress installation and then activate the Plugin from Plugins page.