Answer:
It was a much harder task, near impossible
Step-by-step explanation:
Well, they didn't have any technology, which is the leading tool in forensics nowadays. Modern detectives can, for example, get the brand of the shoe the killer was wearing, while shoes in, say 1888, were very personalized and they were not exactly on a scale. Nowadays you can find a fingerprint and analyze it, compare it to others, but in Jack the Rippers' heyday, they just had to hope someone would survive and identify him.