Two months is not normal, you should really try another pair. Some shoes need a bit of breaking in, okay, but if you're getting blisters after 5 km every time, it means they're not right for you. Salomon can be excellent for some foot types but super aggressive for others - it's often a matter of foot shape, width, or heel height being too high or too low.
Before you buy elsewhere, try to figure out what's wrong. Is it rubbing at the heel, on the sides, or everywhere? The blisters tell you exactly where the problem is. Go to a specialized hiking shop (not just a generic store) and ask to try several brands - Asolo, La Sportiva, Scarpa, whatever. The advantage is being able to walk around in them a bit at the shop and really feel the difference. And honestly, some brands have wider or narrower models, so it's worth testing them out.
Another important thing: size. A lot of people buy hiking shoes too tight because they think it stabilizes better. No. Your foot swells going uphill and you need a bit more space than you think. And switch your socks if you're using cotton - synthetics or merino wool are really much better for avoiding blisters.