I don't know what the "current" version of Noah's is, but according to their website, Noah's is basically out of business and is encouraging users to migrate to Open Classifieds. If Noah's has not, in fact, been recently updated, I would not be surprised if it was incompatible with PHP 5.5. In that case, your best bet may be to migrate to OC, per the website. After a brief read, it wasn't totally clear to me whether all your data will come along, but "migrate" usually implies that it will.
I would assume that Softaculous will drop Noah's in favor of Open in an upcoming update. If you want to stay with Noah's for a while longer, you might check if there is a more recent version available than what's on Softaculous (if that's where you're getting your updates).