Andrew wrote:

I thought the 'free upgrade' (to win 10) was time-limited and expired
ages ago . Have Microsoft changed their policy ?

That's what they said, but in effect they never raised the drawbridge.

I have Win 7 Pro OEM and the disk has 32 and 64 bit versions. I have
installed the 32 bit version, so what version of Win10 would I end up
with ?.

As an upgrade, Win10 Pro 32bit