PDFCreator and PDF Architect are two seperate products, if you only have a PDF Architect printer after the setup, it means something went wrong and it failed to create the PDFCreator printer. Alos, PDF Architect 1 is quite an old version, the current one is PDF Architect 4.
I am not sure if PDF Architect 1 already has this setting, but in current versions the default save location can be configured under help->options->general.
If you’d like to get PDFCreator to install properly, please send us your setuplog.txt (from the main PDFCreator folder) to support(at)pdfforge(dot)org.