Please under no circumstances should you install IconPackager 5 on a modern 64 bit OS.
It WILL break your OS should you ever uninstall in a way that is unfixable easily.
IconPackager10 does not have this problem
I know NB, it should not work but it does, IP 10 gave lots of issues with stability for me so removed it right away, tried out other icon changers and used them for a few weeks, then when i tied down my issue connected to a rogue theme, re installed IP5, i always make an Icon Recovery reg entry and use a dedicated uninstaller like IoBit. I have been using IP5 for every OS since XP, 64 bit included with no issues, i must be an enigma, but i take your advice, happily received, glad i made those extra precautions when i have uninstalled it in the past, maybe that is what saved me from the issues you describe.