Python 3.6 How to specify the external downloader location, please help.

[G-Beni]

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im using python 3.6 with the youtube_dl module on windows 10

Im trying to download Youtube videos with aria2c (because its very slow otherwise)(any other external downloader that can do this is fine for me) as mp3 only, audio only , best quality possible
These are my option settings:
"""
options = {

                'format':'bestaudio/best',
                'extractaudio':True,
                'audioformat':'mp3',
                'outtmpl': Scraped_Music_Path + r'\%(title)s.%(ext)s',  
                'noplaylist':True,
                'nocheckcertificate':True,
                'postprocessors': [{
                    'key': 'FFmpegExtractAudio',
                    'preferredcodec': 'mp3',
                    'preferredquality': '192',
                }],
                'ffmpeg_location': ffmpeg_path, #direct path to ffmpeg.exe
                'ffprobe_location': ffprobe_path, #direct path to ffprobe.exe
            }

"""
this works but is very slow due to youtube throtteling after 30 % download, taking 60 sec for 3MB...
The path to aria2c is also added in the system Path variables.

but i cant figure out how to use the aria2c.exe in this programm

i tried adding this:
'external_downloader': 'aria2c',
'external_downloader_args': 'j 8 -s 8 -x 8 -k 5M', #not sure about these parameters

or this:
'external_downloader': aria2c_path, #direct path to aria2c.exe
'external_downloader_args': 'j 8 -s 8 -x 8 -k 5M', #not sure about these parameters

it also tried printing the error but it just fails without an error.
also im not realy sure what args to specify.

python console output.
"""
[youtube] jxipIRg-f2Y: Downloading webpage
[youtube] jxipIRg-f2Y: Downloading video info webpage
[youtube] jxipIRg-f2Y: Extracting video information
[download] Destination: C:\Users\Me\my\path\Test.webm
"""
and then nothing just breaks

needless to say after searching trough hundreds of google results, and the documentation and the source code im pretty frustrated.

[dstftw]

'external_downloader': 'aria2c' works just fine.

[G-Beni]

@dstftw does it also work to write this : 'external_downloader': aria2c_path, #direct path to aria2c.exe ?
and if the aria2c isnt the problem what else could fail in this code ? do i even need ffmpeg/ffprobe if i have aria2c ?

[G-Beni]

@dstftw i just retried in a new environment and it game me the "AssertionError"
Edit: 'external_downloader': aria2c_path, #direct path to aria2c.exe Works
the error in my python code was in the 'external_downloader_args': 'j 8 -s 8 -x 8 -k 5M', after deleting that it worked

[dstftw]

Path will not work. If you want any help open a new issue providing complete reproducible example source code with complete verbose log of the error.