I also always use this to avoid getting bored on business trips! For a low-spec laptop, the classic version is the best option. And listen, to avoid ads and viruses, download the pure, Steam-based original via
csget. It's designed in the classic style. Like, it has a clean configuration, optimized FPS for any hardware, and supports all anti-cheat systems. And it even features an updated red-and-black interface. In short, it’s a really cool option. Are you planning to warm up with deathmatches or play serious classic rounds with bomb planting on de_maps? If the internet at the hotel is spotty, you can easily play a couple of rounds locally against bots.