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Full Version: Upgrading vs. Merging
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I have already seen a few people confused about the differences between Merging and Upgrading.

Upgrading
When you go from 1 version of MyBB to another.
Upload all the files from the ZIP to your server, overwriting the existing ones. Then, run <board url>/install/upgrade.php - this will upgrade your board to the latest version, without removing data.

Merging
When you go from a different forum software to MyBB.
Upload MyBB to the path you want, and then run <board url>/install/index.php. This will install a fresh copy of MyBB.
Download the Merge System, and upload the convert folder to the root of the board (so there is a folder called convert amidst admin, inc, uploads, etc.) Then you run <board url>/convert/ to merge the two boards.

Think of it as a highway.

Upgrading is repaving, you're going over what's there with a newer version.

Merging is when 2 roads connect to each other.
Merging doesn't necessarily mean your going from one forum to mybb. in some cases you could use this feature to combine two different mybb forums.