Multiple upgrade ?

[CloudyBright]

My forum was at 1.8.12
I downloaded the changed file for 1.8.13
And I downloaded the changed files for 1.8.14

I Uploaded the changed files successfully to achieve version 1.8.13 
Next I uploaded the changed files for 1.8.14 
Everything works.

Problem:  The ACP shows "You are currently running MyBB 1.8.13 whilst the latest generally available release is MyBB [b]1.8.15 (1815)."[/b]
Question_1:  Shouldn't it be showing that it's running MyBB 1.8.14 ???
Question_2:  What should I now do to get updated to 1.8.15 ???

[Wires]

If it's showing "You are currently running MyBB 1.8.13" then you haven't upgraded properly to MyBB 1.8.14. Furthermore, you can update MyBB directly to 1.8.15. I suggest restoring your files and database and following the instructions here.

You need to do a "Full Upgrade" and not a "Changed Files Upgrade".