Error! Please help

Right after installing I got a Multiple Sitemaps menu but when I clicked on it I got this error:

Fatal error: syntax error, unexpected 'array' (T_ARRAY), expecting function (T_FUNCTION) or const (T_CONST) in ~/admin/multipleSiteMaps.app/Settings.php (Line 7)
I do not have to wait for this issue to be resolved so kindly refund
You need to give me more details about the issue that you are facing but before you do that let me check if that last version of it released.
New version is updated you may want to check.
I have Litecart v2.5.4 and I have re-downloaded latest version of your plugin (Version 5.7) and installed but I am getting the error:

Notice: Undefined index: options in ~/includes/library/lib_route.inc.php (Line 47) Fatal error: syntax error, unexpected 'array' (T_ARRAY), expecting function (T_FUNCTION) or const (T_CONST) in ~/admin/multipleSiteMaps.app/Settings.php (Line 7)
Ok that is not error, it is just a notice. The reason of it, the debug mode was active in the last version. I updated Version 5.8 so you can get. That should hide those notices etc. Do you see the UI like in the screenshot ?
I have installed latest version 5.8 but I am still getting the same error below:

Fatal error: syntax error, unexpected 'array' (T_ARRAY), expecting function (T_FUNCTION) or const (T_CONST) in ~/admin/multipleSiteMaps.app/Settings.php (Line 7)

There is no UI. It's just a blank page with the above error. I have decided to no longer use the plugin. Kindly refund.

Thank you
If you dont have any other issues, what is your php version? This is being coded for mostly over php8 and php7.4
Also did you try clearing your browser and site caches? Remove the extension and test if you still can see it.
Done all that and still getting the error. I am using PHP 7.3.

Unfortunately upgrading will be a much bigger job than originally anticipated so upgrading is not feasible.
Ok i have done some changes so it should support php 7.3 as well but that version is already old consider updating that soon.
Test `v5.8.1.zip` lets see it that will solve your issues.