@daddle @TPFLegionaire thank you both for your help. I did manage to open the laptop to upgrade the RAM. It was necessary to use a plastic pry tool such as this one (https://www.amazon.co.uk/Smart-Opening-Plastic-iPhone-Samsung/dp/B00M63PAH2/ref=mp_s_a_1_5?dchild=1&keywords=plastic+prying+tool&qid=1590103205&refinements=p_76%3A419158031&rnid=419157031&rps=1&sr=8-5) to unclip the the clips on the inside of the case without causing damage.
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