You need nodejs: https://nodejs.org
How to run:
You need to change directory to where periscopeDownloader.js is located
node periscopeDownloader.js "https://prod-video-.../.../playlist_123.m3u8" "filename" "cookies"
File name is optional and cookies only needed for private broadcasts
Example cookies:
"Token=eyJhbGciOixxUzI1NiIsInxxCI6IkpXVCIsInZlcnNpb24iOiIyIn0.eyJBbGxvd2VkUHJvdG9jb2xxIjpbImhscyJdLCJCcm9hZGNhc3RJZCI6IjF5bkpPWXJBV0x3S1IiLCJHcmFudFR5cGUiOiJyZWFkIiwiR3JhbnRlZEF0IjoxNTMyMDM3MDk0LCJHcmFudGVkVG8iOiJwcml2YXRlIiwiU3RyZWFtTmFtZSI6IkhsQlFVNlM2bE5ZMEU1OS1RaDM5MHpOVHRGNGlBYmRfUnR6Ni1sLUpYekFvUGhldThLTDNuemZubGt1YUFxx5RQTZLT0dHUklzWk9jU1F6MzFhX2NnIiwiZXhwIjoxNTM0NzE1NDk0fQ.lYRN_c0d5wI2YHXzILinO6BW5EJr55mRc1e_p2THhAM; Service=proxsee; Digest=JHvgbba0_nZpjD5hBN0vujYhf0I3pjR-MeebffhhVs; DirectToken=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCIsInZlcnNpb24iOiIyIn0.eyJBbGxvd2VkUHJvdG9jb2xzIjpbImhscyJdLCJCcm9hZGNhc3RJZCI6IjF5bkpPWXJBV0x3S1IiLCJHcmFudFR5cGUiOiJyZWFkIiwiR3JhbnRlZEF0IjoxNTMyMDM3MDk0LCJHcmFudGVkVG8iOiJwcml2YXRlIiwiU3RyZWFtTmFtZSI6IkhsQlFVNlM2bE5ZMEU1OS1RaDM5MHpOVHRGNGlBYmRfUnR6Ni1sLUpYekFvUGhldThLTDNuemZubGt1YUFCbW5RQTZLT0dHUklzWk9jU1F6MzFhX2NnIiwiZXhwIjoxNTM0NzE1NDk0fQ.lYRN_c0d5wI2YHXzILinO6BW5EJr55mRc1e_p2xxhAM;"
Remember about quotes "".
Tested on windows.