Hi, and welcome to the forum.
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Comodo BOClean is no filescanner as we know from most AntiVirus scanners. However you scan seperate files by drag and drop them to the BOClean screen.
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There can be several issues why the updater isn’t working. You could start looking here :
https://forums.comodo.com/index.php/topic,8339.0.html#msg60553
- Also today version 2.24 is anounced :
https://forums.comodo.com/index.php/topic,8915.0.html
I hope it will help you 
Greetz, Red.