Hi you said you found a key after 04 20? Then copy down those 64 digits after 0420 and you have private key. Then you keep it safe and will need to convert it to Wif code. Let me know if you need help. If you need instruction to run python try there - https://www.wikihow.com/Use-Windows-Command-Prompt-to-Run-a-Python-File thanks reply when your done.