I\'m trying to create an app for demo propose on StackBlitz and must use Angular 5.2.x because my app is still using 5.2.x. I just can\'t downgrade from v6 to v5.2 when I tr
Delete the existing package by clicking the trash can when hovering over the package:
Where it says enter package name type @angular/common@5.2.10 and click enter.
The package will be installed. Repeat for rxjs@5.5.10 and @http/common@5.2.10