After downloading the file:

Use gunzip to uncompress the file if your browser has not done it for you.
chmod +x the executable.
put the executable into a separate directory (say, boinc/).
run the executable.

Instructions on running the core client (command-line options, etc.) are here.

You'll probably want to arrange to run the executable each time your machine boots or you log on. Some examples follow.

Automatic startup on Unix

A set of instructions for running BOINC on Unix systems is here.

Automatic startup on Mac OS X

[ The following is from Berki Yenigun, deadsmile at minitel.net ]

Here's a step by step guide to create a command file for Mac OS X Panther that will automatically launch Boinc command line client each time you log into your account:

Open TextEdit, paste and adapt the following two lines (adapt the path after the cd command to the folder in which you saved Boinc, and the name of Boinc file in the second line to the version you downloaded):
```
cd myapplications/boinc
/boinc_4.19_powerpc-apple-darwin
```
Convert this into plain text format by clicking on Format and then on Make Plain Text (rich text doesn't fit our needs), and save it with .command extension (replace the .txt) : Let's call our file boincscript, the file name & extension should be boincscript.command. Once your file is saved, you can quit TextEdit.
Now open Terminal, using cd command go to the folder where you saved the script file, then type chmod +x boincscript.command to make it executable. (use help if necessary : type man or man man.) After that, you can quit Terminal.

It's almost done : all you need to do now is to add boincscript.command file to the login items in the 'Accounts' pane in 'System Preferences'.

If you want to start Boinc manually again, you simply have to remove boincscript.command from the login items.

PS: You can use the core client command-line options in your script. An example:

/boinc_4.19_powerpc-apple-darwin -return_results_immediately

"; page_tail(); ?>