It would be useful if the application was also provided as just a zip to avoid installer problems.
Probably, but in fact you are the first complaining about the installer. The installer was designed to work also without the need of admin rights. All that is needed is that you do
not select an option that is declared to need admin rights and that you are
not installing in a folder where you have no access. This usually works just fine for non-admins.
What exactly did fail in your case?