Hi Peter,
Please follow these steps:
- extract pkg_seblod_3.5.0.zip
- open pkg_seblod_3.5.0 > extensions
- extract com_cck.zip
- open com_cck > admin > install > src > php5.2
- upload libraries folder to your remote FTP.
This will allow you to fix the issue and use SEBLOD with PHP 5.2
But yes, as Klas said.. we strongly suggest you to move your hosting to PHP 5.3+
Regards,
Saba.