What does the DLC Unlocker do
It opens up paid expansion content: vehicles, weapons and maps from Apex, Contact and the rest of the packs. This applies on servers that allow such content and saves buying each expansion separately.
Which modes make the software most obvious
King of the Hill and similar PvP modes, where a hundred players fight over one position. In cooperative missions against AI nobody is watching you, and the risk drops noticeably.
What about BattlEye
Protection in Arma 3 has been running for years and knows public solutions by heart. Soft HUB's closed build gets past it for longer, though admins on the popular servers also keep blacklists of their own.
Is it useful on roleplay servers
On roleplay projects such as Altis Life the rules run stricter than the game's own: bans land for breaking character, not only for cheating. Highlighting police or other people's stashes shows up in the action logs straight away.
Will an old computer handle the game plus the cheat
Arma 3 bottlenecks on a single processor core, so an extra process alongside it is felt more than on modern engines. Machines with headroom show almost no difference; on borderline ones, close the browser and voice chat.
What is the cost
A daily key goes for 249 roubles, a monthly one for 2499. The week-long option in between gets bought to play through a specific campaign without paying for idle time.
How do you handle a game patch
Wait for the build to update. Arma 3 patches less often than modern projects, so the pauses are short, but running an old loader on a fresh client achieves nothing.