Add FAQ:Package Manager for PackageInstallError

platformio/exception.py

@@ -98,9 +98,9 @@ class UndefinedPackageVersion(PlatformioException):
 class PackageInstallError(PlatformioException):
 
     MESSAGE = (
-        "Could not install '{0}' with version requirements '{1}' for your "
-        "system '{2}'.\n If you use Antivirus, it can block PlatformIO "
-        "Package Manager. Try to disable it for a while.")
+        "Could not install '{0}' with version requirements '{1}' "
+        "for your system '{2}'.\n"
+        "More details: http://bit.ly/faq-package-manager")
 
 
 class FDUnrecognizedStatusCode(PlatformioException):

platformio/managers/package.py

@@ -666,6 +666,7 @@ class BasePkgManager(PkgRepoMixin, PkgInstallerMixin):
                 name, url, requirements, track=True)
         else:
             pkg_dir = self._install_from_piorepo(name, requirements)
+
         if not pkg_dir or not self.manifest_exists(pkg_dir):
             raise exception.PackageInstallError(name, requirements or "*",
                                                 util.get_systype())