best place to download software for 50g

[samo50g]

Hi, I have purchased software for my 50g (some sort of HELP menu where every command is explained) but it made a chaos on my calculator so I removed it: I rewrote old ROM with new one 2.15 and purged some libraries, not the three ones which came with the calculator from factory.

I am happy now but still I wonder if there is maybe some place where one can find such FREE utility program (explanation of all 50g commands, maybe some another useful things for me) which is verified from you experienced users. Thanks.