How to save a Gmail attachment in a desired location on my hard drive using Chrome?

This option is actually within the Chrome settings.

• Click the options button (3 lines)
• Select Settings
• Click Advanced Settings
• Scroll to the section called Downloads

You can change the location here by ticking the box.

It appears that the Chrome settings allow you to open an "Advanced" mode settings page. There, there is a section for handling downloads and where you can check the box telling it to ask the user before every download.

This Settings\Advanced Settings\Downloads\DownloadsLocation option appears to work for every attached file except a PDF (at least on the Mac version of Chrome that I use). When an attachment is a PDF, no pop-up window asking where to save appears as it does for Word, Excel & various image files....it just automatically downloads.

To save a PDF without downloading first, after changing the download location setting, right click on the PDF attachment icon in the email, click "Open Link in New Window," and then once the PDF is open in the new browser window, clicking the download icon will trigger the pop-up, giving you the option to "Save As."