Question edited to fix spelling.
It is a Utility Knife, it has no software downloads. You posted to Computers and Internet? I'll move it to Cutting Tools.
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With the cheapest multimeters costing as little as just a few dollars there is no reason not to have the ability to check things instead of guessing.
With most portable tools and appliances the first thing to check is the power cord because around 60% of the time an internal break is the cause of a tool not starting.
Power tools and appliances often have electronics to provide variable speed or soft start. Checking these is beyond the scope of the home repairer but a multimeter can check continuity to any electronic component and from it to the motor and the ensure there is continuity through the motor.
If everything else is ok the fault is probably with the electronics if there is any. If you are feeling really brave, the final test is to temporarily and safely bypass the suspected component and apply power.
This utility knife reassemblies similar to the original. The only difference is this model uses two screws and that plastic insert. You will align the two metal halves and bring them together. Use care that the blade does not fall out of its holder and the little black plastic piece stays in place, near the blade. This may take a few tries. after you bring the two halves together you will carefully separate the bottom end (farthest from blade). Separate it just enough to slide the plastic insert into position. Once the three pieces align you will know. With little effort the two metal halves will close together. Install the two set screws and test for proper function. I'm including a Youtube video that shows how to properly change the blade and what it will look like after it is reassembled.
https://www.youtube.com/watch?v=5napTSRSyeQ
Use a third blade, preferable mounted to your utility handle, to part them. Handle only from the back side and give the utility knife a slight twist as soon as it is between the points of the new blades.
the utility of a utility knife is far more than most people expect. That is why, everybody should have the best utility knife as a companion to their daily Do-It-Yourself activities. More details BEST UTILITY KNIFE TO BUY FOR DAILY USES
Slicers stay wet from use and constant cleaning (hopefully) in delis and butcher shops. Parts can get rusty, especially one made from aluminum or stainless steel from that era. Soak the offending parts with penetrating oil over night and tap with a mill hammer or other non metallic hammer. Applying some heat with a Wagner heat gun may help loosen things up.
