Errors Errors

Hi,
Just wondering if someone could please help me?
I have recently tried to update from Fusion_php 7 to php 9 and have had nothing but troubles. It started when I uploaded the files to the server and then ensured the files and folders had the correct access. I then entered my sites url with /install.php after it.
All was going well until I didn't get all passes on the file check. After I exited the page to fix the issues I now get an Internal Server Error 500 and haven't been able to fix it.

I have a number of errors logged in my server log but unfortunately I am very amateur and don't know how to fix them.

PHP Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /home2/cfawdor1/public_html/infusions/downloads/downloads.php on line 39

PHP Parse error: syntax error, unexpected T_STRING in /home2/cfawdor1/public_html/infusions/downloads/downloads.php on line 39

$dl_settings = get_settings("downloads");
Line 39 = \PHPFusion\BreadCrumbs::getInstance()->addBreadCrumb([
'link' => INFUSIONS.'downloads/downloads.php',
'title' => \PHPFusion\SiteLinks::get_current_SiteLinks("infusions/downloads/downloads.php", "link_name")



PHP Parse error: syntax error, unexpected T_STRING, expecting T_CONSTANT_ENCAPSED_STRING or '(' in /home2/cfawdor1/public_html/maincore.php on line 18
Line 18 = use PHPFusion\Authenticate;


I have checked the files against the ones in the original files and they are all as per download.

Please help
Matt