Issues that your humans would face:
Climate: A civilization without access to fire would be limited to areas where they wouldn't need heat to survive a cold climate. This would severely affect where they settled.
Body hair: Connected to the above idea, your humans might have stayed hairier.
From Wikipedia: https://en.wikipedia.org/wiki/Control_of_fire_by_early_humans "Environment and nighttime activity The control of fire enabled important changes in human behavior, health, energy expenditure, and geographic expansion...This ability to manipulate their environments allowed them to move into much colder regions that would have previously been uninhabitable after the loss of body hair. Evidence of more complex management to change biomes can be found as far back as 200,000 to 100,000 years ago at a minimum."
Unable to boil water: They would be more prone to waterborne diseases that would have been dealt with by boiling the water. So far more dependent on fresh water sources.
More dependent on other sources of light: The cycle of the moon would be more important since moonlight would be the only way of extending working hours.
From Wikipedia: https://en.wikipedia.org/wiki/Control_of_fire_by_early_humans "activity was no longer restricted to daylight hours due to the use of fire. Exposure to artificial light during later hours of the day changed humans' circadian rhythms, contributing to a longer waking day.[43] The modern human's waking day is 16 hours, while most mammals are only awake for half as many hours.[41] Additionally, humans are most awake during the early evening hours, while other primates' days begin at dawn and end at sundown. 551
Many of these behavioral changes can be attributed to the control of fire and its impact on daylight extension.[41]
Less efficient tools and weapons: Fire was used to draw our impurities or temper certain types of rocks so they were easier to flake and shape into blades.
This article talks about the importance of fire to the development of early weapons:
https://www.sciencemag.org/news/2009/08/early-tools-were-born-fire Early Tools Were Born From Fire Modern humans may have been using fire to make tools more than 30,000 years earlier than once thought, according to archaeologists working in a string of rocky caves along the South African coast. At Pinnacle Point, researchers have found evidence that people began heat-treating stone to make it easier to shape into tools about 70,000 years ago and possibly as early as 164,000 years ago. The find adds to the evidence that a wide range of sophisticated behaviors--from advanced toolmaking to symbolism--were flourishing around the same time."
Socialization: Another issue that's mentioned is the social aspect of gathering around the fire. The wikipedia article I mentioned above stated that contributing firewood for the fire may have been one of the first forms of taxation. Arguably, humans survived and thrived because we developed into social creatures. At the very least, your humans would need a different catalyst to encourage the formation of society. 658