How to have Windows defender offline tool always up-to-date?

Hi guys,

I downloaded the Windows defender offline tool for USB iso bootable file from Microsoft website and now I can use it from boot to scan the machine. When the machine (Windows 7 32-bit) boots by that tool, it wants me to update it before scanning the machine and that is the work I do. It becomes up-to-date and scans the system.
So far every thing is OK.

But after a few hours or a day if I want to scan another PC by that updated Windows defender offline tool, it again wants me to update it (!!) while a little time ago I have updated it!!
Apparently the updating files don't remain/store in that tool.

Is there a way to save the updating files into that tool for future uses?

There are always new definitions being added, that is why it keeps updating. You will just have to live with the updating or use out dated definitions.

For how much of the time those definitions stay/remain up-to-date? Less than two hours?
And if I update it, do those definitions save and remain for next use?

Any more clarifying explanation?

I update that tool while I installed it into USB before. When updating I expect those definitions also attach into the USB and remain within the tool for future uses. So far is it correct? So I don't need much downloading when I downloaded the definitions little time ago.

But in effect, I need much downloading after updating that tool recently.

You seem to be more worried about downloading than keeping the tool updated to be effective at removing malware.

It needs to stay updated to be effective, against the latest threats, just like any good security program.

I've used Windows Defender Offline before, can I re-use the CD or DVD that I created?

If you created a CD or DVD you shouldn't reuse it; it contains definitions to help it detect malware. Definitions are updated frequently so the definition files on the CD or DVD will be out of date. If you created a USB flash drive, you can reuse it. Windows Defender Offline will update the definitions when you rerun the wizard.

Windows Defender Offline: frequently asked questions