Hi @PatoUru,
If you read through the post I linked to above, follow the RESCRIPt link and follow the install instructions on the GitHub page. The commands below should work currently:
conda activate qiime2-2020.8
conda install xmltodict
pip install git+https://github.com/bokulich-lab/RESCRIPt.git
qiime dev refresh-cache
qiime rescript --help
-Best wishes!
-Mike