i want to upgrade my old laptop to windows 10

Several points:

1. Assuming you're running Windows XP, you can not upgrade to 10. You would have to do a clean installation.
2. A computer running XP is very old, and there's a good chance that such an old computer isn't compatible with Windows 10.
3. Even if it's compatible, there's a good chance you will need Windows 10 drivers for it that aren't available.
4. Even if none of the above is a problem, Windows 10 performance on such an old computer will likely be terrible.
5. Given points 2, 3, and 4, you would probably need to have the hardware upgraded before you could install Windows 10. In all probability, it would be cheaper to buy a new computer than to buy a copy of Windows and have your hardware upgraded.

So don't do it. Either stay with XP or buy a new Windows 10 computer.

have a gigabyte laptop was speaking to a support person last night but cant do what he was asking

It's done by a clean install from XP > 10

Do these checks before buying 10.

First thing to do is to make sure that you have the correct system requirements and that your Computer Manufacturer supplies the correct Drivers for 10 for your Model Number.

"Windows 10 System Requirements"

https://www.thurrott.com/windows/windows-10/3884/windows-10-system-requirements

https://www.microsoft.com/en-US/windows/windows-10-specifications#sysreqs

If you read those Microsoft's system requirements for 10, you will find that if you only go on them you will be sadly disappointed in performance.

You should at least double what they say.

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Detailed information on Minimum hardware requirements:

https://docs.microsoft.com/en-us/windows-hardware/design/minimum/minimum-hardware-requirements-overview

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Some Manufacturers have listed Model Numberss tested with 10 at their website:

ASUS - Windows 10 - Which model supports upgrade to Windows 10?

Acer - Windows 10 Creators Update

Dell computers tested for Windows 10 October 2018 Update and previous versions of Windows 10

The following Gateway laptops, desktops and tablets have been tested as being suitable to install Windows 10 Creators Update

HP Products Tested with Windows 10

Lenovo devices tested for Windows 10 version 1809 (October 2018

Samsung - Find out if your system runs Windows 10.

Sony - What do I need to install Windows 10 on my PC?

Toshiba - Models tested

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How to buy Windows 10:

http://www.microsoftstore.com/store/msusa/en\_US/cat/Windows/categoryID.70036700

Cheers.