OCSInstallTool has a deprecated constructor

I have downloaded the ocs-2.3.6, and when try to install it, got the following message:
Deprecated : Methods with the same name as their class will not be constructors in a future version of PHP; OCSInstallTool has a deprecated constructor in C:\Apache24\htdocs\ocs\tools\install.php on line 21

Deprecated : Methods with the same name as their class will not be constructors in a future version of PHP; CommandLineTool has a deprecated constructor in C:\Apache24\htdocs\ocs\lib\pkp\classes\cliTool\CliTool.inc.php on line 44

Deprecated : Methods with the same name as their class will not be constructors in a future version of PHP; Application has a deprecated constructor in C:\Apache24\htdocs\ocs\classes\core\Application.inc.php on line 30

Deprecated : Methods with the same name as their class will not be constructors in a future version of PHP; PKPApplication has a deprecated constructor in C:\Apache24\htdocs\ocs\lib\pkp\classes\core\PKPApplication.inc.php on line 24

Fatal error : Cannot use ‘String’ as class name as it is reserved in C:\Apache24\htdocs\ocs\lib\pkp\classes\core\String.inc.php on line 57

The version of PHP I have installed is PHP 7.3, and Apache is 2.4, and MySQL is 8.0.18.

Please assist.

Is there anyone can assist on the above issue?