[Vega]

In your first post, you said, that you have Arcade. So just must've installed Arcade, am I wrong?

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includes/functions.php
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Find:
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// get CSS width for outerdivwidth from outertablewidth

?????????????????????????????????????????????????? ?????????????????????????????????????????

Above this, add:
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// declares the arcade image directory
$stylevar['imgdir_arcade'] = "images/arcade";

?????????????????????????????????????????????????? ?????????????????????????????????????????
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Save and Close
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But there are still some more steps to do.

I just pasted that from the arcade-install-instructions. I still suggest you to read that.
https://vborg.vbsupport.ru/showthread.php?t=60377