There is a technical way to allow upgrades using the "wrong" English ISO, by changing your system language before running the upgrade. After the install, you will have to download the missing language files (the "other" English) from the Settings app.
1. Before you run Setup, boot into WinPE or Recovery environment:
Code:
REM change Windows language to English-GB ("English International")
DISM /image:C:\ /set-uilang:en-GB
REM change Windows language to English-US
DISM /image:C:\ /set-uilang:en-US
2. Boot back into normal Windows, run the in-place upgrade from the ISO.
3. Open Settings, Time & language -> Language & region, then click Add a language. Add your original English dialect.
I wouldn't recommend this procedure for normal users, unless you're desperate. But it can be done. Finding the right ISO version is always the
best option since you will have the correct media in case of a system failure.
Ignore the snarkiness, our English "cousins" do this every time the topic of en-US vs. en-GB ISO editions comes up. Some non-US users in Commonwealth countries make this mistake in reverse, they install the en-US edition when they really wanted the en-GB edition.
