Well, I made a full system backup and went ahead with the installation of KB4524570. Once this was installed (no problems with this at all), I ran “check for updates” again and was offered to “upgrade to Version 1909”. I accepted and after less than 1 minute my system requested a restart. Less than a minute later I was up and running with Version 1909, Build 18363.476
My Rig: AMD Ryzen 9 5900X 12-Core CPU; ASUS Cross Hair VIII Formula Mobo; Win 11 Pro (64 bit)-(UEFI-booted); 32GB RAM; 2TB Corsair Force Series MP600 Pro 2TB PCIe Gen 4.0 M.2 NVMe SSD. 1TB SAMSUNG 960 EVO M.2 NVME SSD; MSI GeForce RTX 3090 VENTUS 3X 24G OC; Microsoft 365 Home; Condusiv SSDKeeper Professional; Acronis Cyberprotect, VMWare Workstation Pro V17.5. HP 1TB USB SSD External Backup Drive). Dell G-Sync G3223Q 144Hz Monitor.