Nothing more but an idea to help...
In the "Printing preferences" of the "PDF-XChange"-printer, you can - via the Settings tab - change the 'Save' parameters.
To avoid that the 'Save As' dialogbox pops up, you can uncheck "Show 'Save As' dialog", and choose a default "Path" and a default "File Name".
To avoid a warning about overwriting the previous version, you can - at "When file exists" - choose "Always overwrite" or - if you want to keep each version - choose "Auto Number".
In eather case, the PDF will be saved, but the printing (to PDF) process will not be interrupted.