diff --git a/Cargo.lock b/Cargo.lock
index 1df877c..a1caf80 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -518,6 +518,7 @@ dependencies = [
  "tauri-plugin-fs",
  "tauri-plugin-http",
  "tauri-plugin-opener",
+ "zip",
 ]
 
 [[package]]
diff --git a/js-server/scripts/supabase-download.ts b/js-server/scripts/supabase-download.ts
index 6885e18..b784639 100644
--- a/js-server/scripts/supabase-download.ts
+++ b/js-server/scripts/supabase-download.ts
@@ -11,7 +11,10 @@ async function main() {
   const { data, error } = await supabase.storage.from("yomitan").list("ja");
   if (error) throw error;
   if (data) {
-    console.log(data.map((d) => d.id));
+    console.log(data);
+    // no sha256, but may be precomputed and manually placed at data[*].metadata.*
+    // data[*].metadata.{size,contentLength} could be meaningful
+    // GitHub releases uses digest: 'sha256:*' in assets[*].digest currently
 
     const toDownload = data.filter(() => true);
 
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index a8639b0..b707c6f 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -26,3 +26,4 @@ anyhow = "1.0.102"
 tauri-plugin-fs = "2"
 serde_json = "1.0.149"
 serde = "1.0.228"
+zip = "8.1.0"
diff --git a/src-tauri/src/command.rs b/src-tauri/src/command.rs
index 1e8d7b4..2ebac38 100644
--- a/src-tauri/src/command.rs
+++ b/src-tauri/src/command.rs
@@ -1,9 +1,14 @@
-use std::{fs::File, io::Write, path::PathBuf};
+use std::{
+    fs::{File, remove_file},
+    io::Write,
+    path::PathBuf,
+};
 
 use cjdic2_core::{AppService, CJDicError, SqlParam, YomitanRow, YomitanZipImportResult};
 use serde::{Deserialize, Serialize};
 use tauri::{AppHandle, Emitter, Manager};
 use tauri_plugin_http::reqwest::Client;
+use zip::ZipArchive;
 
 #[derive(Deserialize)]
 pub struct YomitanDictEntry {
@@ -27,18 +32,21 @@ pub async fn init_yomitan(
         .map_err(|e| CJDicError::Error(e.to_string()))?;
 
     for d in dicts.iter().clone() {
-        if !app_dir.join(&d.filepath).exists() {
-            download_url_local(
-                d.url.clone(),
-                app_dir.clone(),
-                d.filepath.clone(),
-                |progress| {
-                    app.emit("download-url-progress", progress).unwrap();
-                },
-            )
-            .await
-            .map_err(|e| CJDicError::Error(e.to_string()))?;
+        let zip_path = app_dir.join(&d.filepath);
+        if zip_path.exists() && File::open(zip_path).is_ok_and(|f| ZipArchive::new(f).is_ok()) {
+            continue;
         }
+
+        download_url_local(
+            d.url.clone(),
+            app_dir.clone(),
+            d.filepath.clone(),
+            |progress| {
+                app.emit("download-url-progress", progress).unwrap();
+            },
+        )
+        .await
+        .map_err(|e| CJDicError::Error(e.to_string()))?;
     }
 
     let zip_files: Vec<PathBuf> = dicts
@@ -155,8 +163,6 @@ where
         let content_length = response.content_length().unwrap_or(0);
         let mut file = File::create(&file_pf).map_err(|e| CJDicError::Error(e.to_string()))?;
 
-        println!("{}", content_length);
-
         // Downloading the file in chunks
         let mut downloaded: u64 = 0;
         while let Some(chunk) = response
@@ -174,6 +180,18 @@ where
                 downloaded,
             });
         }
+
+        // Verify download completeness
+        if content_length > 0 && downloaded < content_length {
+            // Delete incomplete file
+            drop(file); // ensure file handle is released before deleting
+            remove_file(&file_pf).ok();
+            return Err(CJDicError::Error(format!(
+                "Incomplete download: expected {} bytes, got {}",
+                content_length, downloaded
+            )));
+        }
+
         println!("File downloaded successfully to {:?}", &file_pf);
     } else {
         eprintln!("Failed to download file: {:?}", response.status());