https://www.sphinx-soft.com/download/W10FC7.5/Windows10FirewallControl-Portable.zip
https://www.sphinx-soft.com/download/W10FC7.5/Windows10FirewallControlFree-XP-Setup.exe
Thanks a lot! But - I don't want to spend any more money on/to my old PCs ;o)
BTW: I just found some XP-ready Freeware Alternatives ... cheers :o)
Privatefirewall 7.0.30.3 (Privacyware) https://www.softpedia.com/get/Security/Firewall/Privatefirewall.shtml
SterJo NetStalker (Standalone Blocklist Firewall, Traffic Monitor, portable, multilingual) https://www.sterjosoft.com/netstalker.html
PS: Thanks at all ! Please no Installer or ''Bloatware'' like Comodo, Zone Alarm, Norton etc. ;o)