I tried to upgrade my flutter from 1.12.13 hotfix 7 stable to 1.12.13.hotfix 8 stable, by running flutter upgrade on my windows 7 64 bit machine
now, everytime I run "flutter run", "flutter pub get", etc it runs so slow and sometimes stuck. and I always get some warnings like 'Unblock-file' is not recognized, and "flutter requires PowerShell 5.0 or newer". It also shows "Checking SDK Version...", "building flutter tool..." and "running flutter upgrade..."