The word Instaling is misspelled against Installing, which is present continuous of "Install"
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Installing has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings insta & ing which should not be misspelled with single 'L'
Wrong Spelling: insta-l-ing
Correct Spelling: insta-ll-ing
Find more wrongly spelled words of Installing to spell it well.