diff --git a/Impact/Impact-v1.6.3.1.ckan b/Impact/Impact-v1.6.3.1.ckan
index c5ea892b30..88a636e5c8 100644
--- a/Impact/Impact-v1.6.3.1.ckan
+++ b/Impact/Impact-v1.6.3.1.ckan
@@ -13,10 +13,10 @@
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     "download": "https://github.com/tomforwood/kerbal-impact/releases/download/v1.6.3.1/Impact.zip",
-    "download_size": 5016740,
+    "download_size": 2512144,
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+        "sha1": "ABC1B8406ABDBC050EC6759DF6CADA7DC3D02F11",
+        "sha256": "42B4E9349E464CAA4954D789F5F750CBE389E216F4A933C125F20369678313B4"
     },
     "download_content_type": "application/zip",
     "x_generated_by": "netkan"