"Reloaded" and "Repacked" mean they are cracked or use key generator. So those would be illegal or rather pirated versions. The actual laws varies between countries, so calling something legal/illegal is not easy.
If those games can be found somewhere, like GOG.com for example, then using pirated copies is against copyright laws. If not, then the abandonware becomes a thing. Still, actually paying for them is better if only to calm your nerves about being thief.