Update: The testnet will be updated to the new version later, and the block height will start from 1. Only members who have applicable PID can participate in the mining. So kindly suggest that you could check your PID through this link：https://diskcoin.org/PidGenerator/index.html#btnGroup
If your PID is applicable, you are no need to replot files to mine DISC.
If your PID is not applicable, you need to use the tool to generate new PID and then plot if you want to mine DISC.
And our PID generator has already open source, you could check the details on GitHub: https://github.com/diskcoin-apps-team/PIDGenerator
Kindly note that with the PID generated by Diskcoin PID Generator, you could also mine other POC coins together. For DISC, the only function of the PID is to plot, which does not require binding.