A somewhat different way of doing it:

perl -lne 's[\A\s+][]; s[\s+\Z][]; $last=pop [split /\s+/] if $_; END 
+{ print $last }' scan.log
[download]

• -l auto-chomps
• -n wraps the code in a while(<>){ ... }
• The substitutions remove leading and trailing blanks
• The split extracts the words in the line (whitespace-separated)
• The pop takes the last word
• We save this for each line
• At end of file, we print the current last word, which will be from the last line

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