To solve this issue you need to open a Commandline with Admin privileges once (Win+R → “cmd” → Shift+Rightclick → “Run as Administrator”), go to your flow root folder and run flow cache:warmup . This will lead to all symlinks be created with the required admin privileges. Afterwards you can continue to do all further work with a normal non-elevated command line, at least until you install/de-install a package that has public resources and hence needs to update the symlinks.
I can only recommend to do all dev related work in Windows 10+ through WSL2 though.