Looking for the exact increase in install size as have very limited SD space. Would appreciate it if it could also be clarified if the install size can be reduced via the install options.
UPDATE:
Searching around the internet suggested about an additional 26G without high-resolution assets, so in the absence of more authoritative info took the risk and bought the expansion.
So far it does not seem to have significantly increased the install size on my laptop, if at all - the size of the D4 folder after getting the expansion is 67GB (without high-resolution assets) - which is the same or close to what it was before (I remember it being around 60GB).
So that’s a relief!