I've been asked to get an older laptop running Win 7 secure for the Internet.
It has about-to-expire McAfee's security suite and I'm wondering if Win 7 will
run Windows Defender. I know about MWBytes, etc, but I'm wondering if WD
will be as effective on Win 7 as it is on Win 10.

I've found this page from MS, updated 19 April 2019, which seems to indicate
it would be OK, but I guess I'm looking for some real experience.

(Yes, the person for whom... want to keep Win 7.)

Ta.

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More info: Win 7 Home Premium SP1 Build 7601.

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---And in addition to the security, it has only 2GB RAM, I found this from a specs sheet:
Memory: 2GB DDR3 (1066MHz) expandable to 4GBRAM
Slot allocation: One slot used, One slot free

To upgrade to its maximum 4GB, does this mean I need to use one 4GB stick only, or can I
have 2 x 2GB sticks?