Wix installer does not overwrite previous version of an executable

Question

I have a very simple installer - copy a single dll to a Program Files subfolder and register it with regsvr32.exe. Works great, but if an older version of the dll is install

Answer 1

Short answer (the other one became too messy): try removing this line and let the package ID be auto generated by setting it to "*":

Note that you must stop using all previous MSI builds after uninstalling them all. This is due to the faulty hard coded package guid which can cause unpredictable and unforeseen problems.