i tried everything but steam refuses to let me download anything!

so long story short, i use steam tools to download games in steam for free and it worked for me nicely since mid 2025, but a month ago it stopped working and started showing me an error once i try to download again and same thing, i tried EVERY method but nothing worked, it shows "connection error" but wifi is connected and normal, i tried updating steam and steam tools and clear steam download cache but it still isnt fixed, even for game updates

quick note: does that for every game i tried