ImportError: BigVGAN not installed, can't use BigVGAN vocoder

[havok2-htwo]

No matter what I try, I always end here with these errors. Normal tortoise works fine, but not the fast one.

File "C:\Users\havok2.conda\envs\tortoise\lib\site-packages\streamlit\runtime\scriptrunner\script_runner.py", line 565, in _run_script exec(code, module.dict) File "C:\Users\havok2.conda\envs\tortoise\Scripts\app.py", line 8, in from tortoise.api import MODELS_DIR File "C:\Users\havok2.conda\envs\tortoise\tortoise\api.py", line 19, in from tortoise.models.vocoder import VocConf File "C:\Users\havok2.conda\envs\tortoise\tortoise\models\vocoder.py", line 13, in raise ImportError(

any Ideas where I took the wrong way? When I try to install BigVGan I always get an error too: ERROR: Failed building wheel for pesq but the rest looks installed correctly. I give up here. Thanks for any help.

EDIT 31.03.23,
I managed to get a new single Error: 

Traceback (most recent call last):

File "X:\stable-diffusion-infinity\anaconda3\lib\site-packages\streamlit\runtime\scriptrunner\script_runner.py", line 565, in _run_script exec(code, module.dict) File "X:\stable-diffusion-infinity\anaconda3\envs\ttsfast\scripts\app.py", line 8, in from tortoise.api import MODELS_DIR ModuleNotFoundError: No module named 'tortoise'