'''RT_Productions''' the part is available at places [https://www.fixez.com/ipod-touch-4th-gen-charging-dock-port-replacement?utm_source=google_shopping&gclid=CjwKCAiAn7L-BRBbEiwAl9UtkJTmpFd4eTJ3oQfAEOOx2gkgg7Cx8w8pZ7GgxynTI8vm5j4GyMlBYBoCyJEQAvD_BwE|like this] as well as [https://www.diymobilerepair.com/ipod-touch-4th-gen-dock-port-replacement?gclid=CjwKCAiAn7L-BRBbEiwAl9UtkCd6SH4kByVw6THs_Em_6-H8TmRoq9qQLtq9aPZWEDyirWiM__llWxoC0soQAvD_BwE|on here] I have purchased from both vendors before without difficulties (No, I am not on their payroll :-). Here is the guide for the repair [guide|50500]
Finally, I download old versions of most software I need to run under XP etc from oldversion.com all the time without any issues.