I tried to execute the script directly:
----------------------------------------------------------------------
/Users/myName/Desktop/WiPha/Wipha\ Installer.app/Contents/MacOS/Web\ iPhoto\ Access\ Installer /Users/myName/Desktop/WiPha/Wipha\ Installer.app
----------------------------------------------------------------------

It ask for my admin password and then give me this:
----------------------------------------------------------------------
Saving previous wipha preferences
cp: /Users/cyprien/Sites/wipha/data/users.ser: No such file or directory
... Abort ...
----------------------------------------------------------------------

I then removed the WiPha directory in the Sites directory. It became a bit better, I had the following in the WiPhA window:
----------------------------------------------------------------------
Decompacting WiPhA in your Sites folder (/Users/cyprien/Sites)

Setting permissions on these files

Setting setuid bit (cyprien) on permission corrector executable

Authorize Apache to go through your Pictures folder

Grant write access to Apache on the WiPhA data directory

Configuring Apache to handle php
    Was already done

Configuring Apache to use local .htaccess for user cyprien
    Was already done

Installation complete

Start (or restart) the Web server as explained in the documentation, and type the following URL in your web browser to go to WiPhA
http://localhost/~cyprien/wipha
-----------------------------------------------------------------

But in the terminal - which might interest you - I had this:
----------------------------------------------------------------------
/Users/myname/Desktop/WiPha/WiPha Installer.app/Contents/Resources/script: line 90: [: !=: unary operator expected
/Users/myname/Desktop/WiPha/WiPha Installer.app/Contents/Resources/script: line 108: [: !=: unary operator expected
/Users/myname/Desktop/WiPha/WiPha Installer.app/Contents/Resources/script: line 138: unexpected EOF while looking for matching `"'
/Users/myname/Desktop/WiPha/WiPha Installer.app/Contents/Resources/script: line 139: syntax error: unexpected end of file
----------------------------------------------------------------------

So it seems like there are some "hidden" errors here. I took a look at the script, and it seems that it doesn't like every time you use "" (2 quotation symbols consecutively)