I know this is an old question but google still took me here so it probably will other people.

In Powershell...

If you're on a newer version than 312, replace it with the relevant version in all of the below commands.

Scan a folder:

cd c:\example\stuffiwanttoscan\
& $env:appdata\Python\Python312\Scripts\checkov.cmd -d .

Alternatively IF you want to add it to your path statement (be conscious of not cluttering your path statement up too much) :

$env:path +=";$env:appdata\Python\Python312\Scripts\"

Once it's in your path statement (only run the above command once, not every time), then you can run checkov without prefixing it with the location every time eg:

cd c:\example\stuffiwanttoscan\
checkov -d .

(thanks to @stackuser4532's comment on the question for pointing me to the correct folder location)