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Plz if you don't have a USB you don't have to buy one cuz I'm not advertising a USB.
Most browsers will automatically download into your computer's default 'Downloads' folder, but you can prompt your browser to ask you where to save your files by doing the following:- Chrome — Click ⋮ in the top-right corner, click Settings, scroll down and click Advanced, scroll down to the 'Downloads' section, and click the 'Ask where to save each file before downloading' switch if it's grey.
- Firefox — Click ☰ in the top-right corner, click Options (or Preferences on a Mac), scroll down to the 'Files and Applications' section, and check the 'Always ask you where to save files' box.
- Edge — Click ⋯ in the top-right corner, click Settings, scroll down and click View advanced settings, and click the grey 'Off' switch in the 'Ask me what to do with each download' section (if the switch is blue, you're set).
- Safari — Click Safari in the top-left corner, click Preferences..., click the 'File download location' drop-down box, and click Ask for each download in the drop-down menu.
As with any software program, it is a good idea to name and save your presentation immediately, and save your changes frequently while you work.

In PowerPoint 2013 and newer versions, you can save your desktop presentation to your local drive (such as your laptop), a network location, a CD, a DVD, or a flash drive. You can also save it as a different file format. If you want to save your presentation to the web location, see Save and share a presentation to OneDrive.
On the File tab, select Save.
Do of the following:
To save to your local drive, such as your laptop, a flash drive, CD or DVD drive, select Computer.
To save to a SharePoint Library, select SharePoint.
To save your presentation to a web location, see Save and share a presentation to OneDrive.
Under Save As > Recent Folders, select Browse, pick a path and file folder, and then name the file.
Select Save.
Save your presentation file in a different file format

Note: To save files in PDF (.pdf) or XPS (.xps) file formats, see Save or convert to PDF or XPS.
On the File tab, select Save As.
Under Save As, do one of the following:
Under Recent Folders, select Browse, pick a path and file folder, and then name the file.
In the Save as type list, pick the file format that you want.
Select Save.
Save your presentation in an earlier version of PowerPoint
How To Download A Powerpoint To A Flash Drive In Mac
In PowerPoint 2013 and newer versions, you can save files to an earlier version of PowerPoint by selecting the version from the Save as type list in the Save As box. For example, you can save your PowerPoint presentation in the newest PowerPoint Presentation format (.pptx), or as a PowerPoint 97-2003 Presentation (.ppt).
Notes:
PowerPoint 2013 and newer versions use an XML-based .pptx file format introduced in the 2007 Office release. These files can be opened in PowerPoint 2010 and PowerPoint 2007 without special add-ins or loss of functionality. For more information, see Open XML Formats and file name extensions.
For more information about compatibility between files from different releases, see Check whether a presentation can open with PowerPoint 2003 or earlier.
How To Download Document To Flash Drive
Open Document format
Microsoft Office supports the ability to save a presentation file in the OpenDocument Presentation format (.odp).
When you use the Save As or Save a Copy command, the option to save in .odp format is listed at the end of the Save as type list of options.
Click the File tab.
Click Save As, and then do one of the following:
For a presentation that can be opened only in PowerPoint 2010 or PowerPoint 2007, in the Save as type list, select PowerPoint Presentation (*.pptx).
For a presentation that can be opened in either PowerPoint 2010 or earlier versions of PowerPoint, select PowerPoint 97-2003 Presentation (*.ppt).
In the left pane in the Save As dialog box, click the folder or other location where you want to save your presentation.
In the File name box, type a name for your presentation, or do nothing to accept the default file name, and then click Save.
From now on, you can press CTRL+S or click Save near the top of the screen to save your presentation quickly at any time.
Click the Microsoft Office Button , and then click Save As.
Click Save As, and then do one of the following:
For a presentation that can be opened only in PowerPoint 2007, in the Save as type list, select PowerPoint Presentation (*.pptx).
For a presentation that can be opened in earlier versions of PowerPoint, select PowerPoint 97-2003 Presentation (*.ppt).
In the left pane in the Save As dialog box, click the folder or other location where you want to save your presentation.
In the File name box, type a name for your presentation, or do nothing to accept the default file name, and then click Save.