diff --git a/platformio/__init__.py b/platformio/__init__.py
index d05313bd..e7774802 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (3, 3, "0a14")
+VERSION = (3, 3, "0a15")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"
diff --git a/platformio/exception.py b/platformio/exception.py
index f4743d4c..bc16f2e2 100644
--- a/platformio/exception.py
+++ b/platformio/exception.py
@@ -94,8 +94,10 @@ class UndefinedPackageVersion(PlatformioException):
 
 class PackageInstallError(PlatformioException):
 
-    MESSAGE = "Can not install '{0}' with version requirements '{1}' "\
-              "for your system '{2}'"
+    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."
 
 
 class FDUnrecognizedStatusCode(PlatformioException):