In some aspects, a method for updating software using a rules engine is provided. The rules engine selects a handler for updating a non-updated string of code of a plurality of strings of code of a file and according to a set of rules. The set of rules associates the handler with updating a unique non-updated string of code. The rules engine also instructs the handler to scan the plurality of strings of code, identify, based on the scanning, the non-updated strings of code uniquely associated with the handler, and update the non-updated string of code. The rules engine further receives, from the handler, an indication that the non-updated string of code uniquely associated with the handler is an updated string of code. In addition, the rules engine generates for display on a display screen at least the updated string of code.