The disclosed computer-implemented method for dynamically customizing software programs may include (i) receiving, from a client device, a request for a software program with client-specific customization requirements and (ii) providing, to the client device, a digitally signed download manager for downloading a client-specific version of the software program that satisfies the client-specific customization requirements, where the digitally signed download manager provides the client-specific version of the software program to the client device by (a) downloading, from the backend computing system, both the software program and client-specific data that satisfies the client-specific customization requirements and (b) customizing, using the client-specific data, the software program in a manner that satisfies the client-specific customization requirements. Various other methods, systems, and computer-readable media are also disclosed.