Hi!
The Site Transfer Wizard should be on the same place when installing Akeeba Backup Professional 3.3.5. However, there is a bug in Joomla! 1.5's extension installer. When you upgrade a component, Joomla! sometimes "forgets" to copy the files which were not present in the previous version of the component. This includes the Site Transfer Wizard files, as they were moved to a new location in version 3.3.5. This bug seems to have been fixed in Joomla! 1.7, though.
There is a simple workaround. Download the latest version's ZIP installer from https://www.akeebabackup.com/latest and save it to your disk. Go to Extensions, Install/Uninstall, click on Browse, select the ZIP file you just downloaded, click on Upload and Install. IMPORTANT: DO NOT uninstall the component before re-installing it; doing so will lose all of your settings. After doing that, Joomla! should have now copied all of the files and you can use the Site Transfer Wizard.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!