FWIW, the problem has nothing to do with the PHP version. If I copy & paste the install_sql data directly into phpMyAdmin, I get the following message:

Code:
Error

SQL query:

CREATE TABLE testimonials_manager(
'testimonials_id'int( 11 ) NOT NULL AUTO_INCREMENT ,
'language_id'int( 11 ) NOT NULL default '1',
'testimonials_title'varchar( 64 ) NOT NULL default '',
'testimonials_url'VARCHAR( 255 ) NULL DEFAULT NULL ,
'testimonials_name'text NOT NULL ,
'testimonials_image'varchar( 254 ) NOT NULL default '',
'testimonials_html_text'text,
'testimonials_mail'text NOT NULL ,
'testimonials_company'VARCHAR( 255 ) NULL DEFAULT NULL ,
'testimonials_city'VARCHAR( 255 ) NULL DEFAULT NULL ,
'testimonials_country'VARCHAR( 255 ) NULL DEFAULT NULL ,
'testimonials_show_email'char( 1 ) default '0',
'status'int( 1 ) NOT NULL default '0',
'date_added'datetime NOT NULL default '0000-00-00 00:00:00',
'last_update'datetime NULL default NULL ,
PRIMARY KEY ( 'testimonials_id' )
) TYPE = MYISAM ;

MySQL said: Documentation
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''testimonials_id' int(11) NOT NULL auto_increment,
  'language_id' int(11) NOT N' at line 2
The problem is with the creation of the testimonials table ...