See the JUSTSYSTEMS website. (in Japanese)
What is the difference between the “32-bit version” and the “64-bit version”?
See “Choose between the 64-bit or 32-bit version of Office” (link to Microsoft site).
What is the “upgrade version”?
This means that the OS can be upgraded (changed to a higher version) only if it is already running a Windows OS.
If your PC already has a Windows OS when you buy it, you are eligible.
In the case of a Mac, the upgrade can be applied as an OS that runs on virtual environment software or boot camp that can run on a Mac.
Downgrading the OS is also possible, but not recommended.
What is the difference between “new install” and ” upgrade install”?
A “new install” installs a new Windows OS.
In contrast, an “upgrade install” inherits the settings of the original Windows OS.
Can I install the “upgrade version” to my self-built computer or computers without any OS?
You cannot install unless you have a license that you can upgrade from.
What should I do if I do not have any OS to upgrade from?
You need to separately obtain an OS to upgrade from. The upgrade version can be used if you have a package license that allows installation of a new OS.
Can I newly install a Windows OS by upgrading from an OEM product from a different computer?
No, you cannot.
Are there any restrictions on the versions or editions of Windows OS that can be “upgraded”?
Yes. Please check this table.
Reference: Windows 10 upgrade paths (link to Microsoft site)
Counting when using virtualization.
Regarding virtualization at the client OS, up to four virtual OSEs are allowed per license per terms of the Software Assurance (SA) privilege.
EES activation is unsuccessful.
Please see “If authentication fails“.
If you are off-campus, please use the VPN service to create an on-campus network environment.