Simple Method:
1- Create a temp Gmail
2- Go to https://rsocks.net/proxy-checker and create an account with that temp Gmail. You can use https://www.gmailnator.com/
3- Go to free proxy in the left then press activate the package. Change the IP if you want to use that proxy on RDP or on another PC.
4- press start, get proxy list go to by file and download .txt file!
Enjoy!