sample expired issue

[onetwotrea]

thanks for help!!
i am trying to get familiar with vbtpro and i start to learn some examples on vbt (open-source version) website. In the article "Stop Loss, Trailing Stop, or Take Profit? 2 Million Backtests Shed Light", i come across functions ,such as vbt.utils.data.concat_symbols and vbt.split_into_ranges etc. , which do not exist anymore. my confusion is that how come i am able to get the substitutes intuitively.