Can any one please help in explaining the exact steps required to be perform while upgrading courier 2.0 to 2.5?

I have installed Courier 2.0 successfully from the installation guide but got struck while upgrading it to 2.5.

Following steps were there in the installation and configuration pdf for Courier 2.5 available on umbraco site:

If you already have Courier 2.0 installed, follow these steps to upgrade to 2.5:

1. Backup your

/config/courier.config file

2. Copy the contents of /bin, /config and /umbraco from the manual update zip, to the root of your site

Castle.DynamicProxy2.dll and it’s .pdb file from the /bin folder

4. Update the

/config/courier.config file with settings from your backed-up one.

a. Ensure your

<repositories> node is copied over

b. You resource filters

c. And the itemdataresolver settings

<repositories> node is the crucial one

5. Your done

I m not clear about the secound and third step as to what "manual update zip" is reffered here!

and then in 3rd step, from which /bin folder the files need to be deleted?

Any pointers in this regard will be really helpful.

Thanks.