I didn't see any installation instructions for this.....so I copied all the files where they r supposed to go then set up my control panel...........but now none of my settings are there....none of my posts are there the ONLY thing it saved was my memberlist, we had over 16,000 posts.....I'd really like to have them back if anybody could help !!!!! ....I still have my posts from 5.47 but the ubb_upgrade.cgi doesn't work right, I get a error message

this is the error:
Software error:
Can't locate Date.pl in @INC (@INC contains: /usr/lib/perl5/5.00503/i386-linux /usr/lib/perl5/5.00503 /usr/lib/perl5/site_perl/5.005/i386-linux /usr/lib/perl5/site_perl/5.005 .) at ubb_upgrade.cgi line 33.