I'm not the author of MobInfo2.
The author of Mobinfo is Skeeve.

DON'T FORGET TO BACKUP YOUR OWN FILE FIRST THAT IS ON YOUR SAVED VARIABLES FOLDER.

Quoting Skeeve:
Hi everyone,

Just now I discovered this nice new service. I'd like to add something to what ntex said:

To import Mob data PLEASE read and use the instructions from the MobInfo ReadMe.txt. Thats quite important and avoids accidental loss of data or file corruption. You will also find in there instructions on how to backup your current MobInfo database file before importing the new data.

Also please note that MobInfo data files are language specific and can NOT be mixed between languages. I assume that this particular download is for the English WoW (ntex correct me if I'm wrong). Therefore this should be downloaded and used for the English WoW ONLY ! Using it with any other language version of WoW will not work.

Other then that: Enjoy MobInfo,
Skeeve
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INSTRUCTIONS (Extracted from Readme.txt):
Here are the detailed import instructions:

Close your WoW client
Backup your MobInfo database as explained above
Extract the file to 'World of Warcraft/Interface/AddOns/'
So in the end you must have the file in: 'World of Warcraft/Interface/AddOns/MobInfo2/MI2_Import.lua'
Start WoW and login with one of your chars
Open the MobInfo options (enter '/mi2' at the chat prompt) and go to the 'Database' options page. Near the bottom of the page you should now see whether the AddOn has found valid data to be imported. If you did everything correctly the 'Import' button should be clickable.
Choose whether you want to import only unknown Mobs, otherwise all Mobs will get imported. If a Mob already exists in your database and you choose to import it the data of the new Mob will get added to the data of the existing Mob. Now click the Import button to star the database import operation. In your normal chat window you will see a summary of the import results.
Logout to cause WoW to save your now extended MobInfo database file. You should now delete the file 'MI2_Import.lua'. It is no longer needed and it will waste memory as long as it exists.

TIP1: Use the 'import only unknown Mobs' if you know that there is a large amount of overlap between your current database and the imported database. For instance if you import data from the same source again (because he released a newer version).

TIP2: You can also use this Import feature to import databases of the 'MobHealth' AddOn. Use the instructions exactly as listed above, but in step 2 rename 'MobHealth.lua' (the MobHealth database file from 'savedvariables' folder) to 'MI2_Import.lua'.
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Any bugs or hints regarding to the data, just say anything here.

THIS VERSION IS FOR ENGLISH CLIENTS!

Mobinfo Database