old_url = "https://a...content-available-to-author-only...c.xyz/f/b/go_cc_Jpterxvid_avi_mp4"
url = old_url.replace('/f/', '/d/').rsplit("/", 1)[0]
print(url)
b2xkX3VybCA9ICJodHRwczovL2EuLi5jb250ZW50LWF2YWlsYWJsZS10by1hdXRob3Itb25seS4uLmMueHl6L2YvYi9nb19jY19KcHRlcnh2aWRfYXZpX21wNCIKdXJsID0gb2xkX3VybC5yZXBsYWNlKCcvZi8nLCAnL2QvJykucnNwbGl0KCIvIiwgMSlbMF0KcHJpbnQodXJsKQ==