diff --git a/common/schema.js b/common/schema.js
index ed76540..96b0d4f 100644
--- a/common/schema.js
+++ b/common/schema.js
@@ -30,14 +30,6 @@ export const zData = z.object({
 });
 /** @typedef {z.infer<typeof zData>} Data */
 
-export const zError = z.object({
-  url: z.string().optional(),
-  datasetIdentifier: z.string(),
-  distributionIdentifier: z.string(),
-  kind: z.enum(["generic_error", "http_error", "infinite_redirect"]),
-  error: z.string().optional(),
-});
-
 export const zDumpMetadata = z.object({
   sites: z.array(
     z.object({
@@ -49,3 +41,23 @@ export const zDumpMetadata = z.object({
   ),
 });
 /** @typedef {z.infer<typeof zDumpMetadata>} DumpMetadata */
+
+const zDumpErrorAlways = {
+  url: z.string().optional(),
+  datasetIdentifier: z.string(),
+  distributionIdentifier: z.string(),
+};
+export const zDumpError = z.discriminatedUnion("kind", [
+  z.object({
+    ...zDumpErrorAlways,
+    kind: z.literal("http_error"),
+    status_code: z.number(),
+  }),
+  z.object({ ...zDumpErrorAlways, kind: z.literal("infinite_redirect") }),
+  z.object({
+    ...zDumpErrorAlways,
+    kind: z.literal("generic_error"),
+    error: z.string(),
+  }),
+]);
+/** @typedef {z.infer<typeof zDumpError>} DumpError */
diff --git a/downloader/download_json.js b/downloader/download_json.js
index 9aeebdf..98b7b3a 100644
--- a/downloader/download_json.js
+++ b/downloader/download_json.js
@@ -1,8 +1,8 @@
-import { mkdir, writeFile } from "node:fs/promises";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import { join, normalize } from "node:path";
 import { targetsPorDefecto } from "./config.js";
 import { generateDataJsonFromCkan } from "./ckan_to_datajson.js";
-import { zData } from "common/schema.js";
+import { zData, zDumpError } from "common/schema.js";
 import {
   StatusCodeError,
   TooManyRedirectsError,
@@ -12,6 +12,9 @@ import { createWriteStream } from "node:fs";
 import pMap from "p-map";
 
 let urls = process.argv.slice(2);
+if (process.argv[2] === "retry") {
+  urls = process.argv.slice(3);
+}
 if (urls.length < 1) {
   urls = targetsPorDefecto;
 }
@@ -25,57 +28,69 @@ const targets = urls.map((url) => {
     return { type: "ckan", url: url.slice("ckan+".length) };
   } else return { type: "datajson", url };
 });
+const action = process.argv[2] === "retry" ? retryErrors : downloadEverything;
 for (const target of targets)
-  downloadFromData(target).catch((error) =>
+  action(target).catch((error) =>
     console.error(`${target.type}+${target.url} FALLÓ CON`, error)
   );
 
 /**
  * @param {Target} target
  */
-async function downloadFromData(target) {
+async function downloadEverything(target) {
   const outputPath = generateOutputPath(target.url);
   const json = await getDataJsonForTarget(target);
-  const parsed = zData.parse(JSON.parse(json));
 
   await mkdir(outputPath, { recursive: true });
   await writeFile(join(outputPath, "data.json"), json);
   await writeFile(join(outputPath, "url.txt"), `${target.type}+${target.url}`);
+
+  await downloadFiles(target);
+}
+
+/**
+ * @param {Target} target
+ */
+async function retryErrors(target) {
+  const outputPath = generateOutputPath(target.url);
+  const jsonl = await readFile(join(outputPath, "errors.jsonl"), "utf-8");
+  const errors = jsonl
+    .split("\n")
+    .filter((l) => l.length > 0)
+    .map((line) => zDumpError.parse(JSON.parse(line)));
+
+  await downloadFiles(target, (job) =>
+    errors.some(
+      (e) =>
+        e.datasetIdentifier === job.dataset.identifier &&
+        e.distributionIdentifier === job.dist.identifier
+    )
+  );
+}
+
+/**
+ * @param {Target} target
+ * @param {(job: DownloadJob) => boolean=} filterJobs
+ */
+async function downloadFiles(target, filterJobs) {
+  const outputPath = generateOutputPath(target.url);
+  const json = await readFile(join(outputPath, "data.json"), "utf-8");
+  const parsed = zData.parse(JSON.parse(json));
+
+  let nFinished = 0;
+  let nErrors = 0;
+  /** @param {ReturnType<typeof encodeError>} err */
+  const onError = (err) => {
+    errorFile.write(JSON.stringify(err) + "\n");
+    nErrors++;
+  };
+
   const errorFile = createWriteStream(join(outputPath, "errors.jsonl"), {
     flags: "w",
   });
   try {
-    let nFinished = 0;
-    let nErrors = 0;
-    /** @type {DownloadJob[]} */
-    const jobs = parsed.dataset.flatMap((dataset) =>
-      dataset.distribution
-        .filter(
-          /** @returns {dist is import("common/schema.js").Distribution & {downloadURL: string}} */
-          (dist) => {
-            try {
-              if (!dist.downloadURL) {
-                throw new Error("No downloadURL in distribution");
-              }
-              patchUrl(new URL(dist.downloadURL));
-              return true;
-            } catch (error) {
-              errorFile.write(
-                JSON.stringify(encodeError({ dataset, dist }, error)) + "\n"
-              );
-              nErrors++;
-              return false;
-            }
-          }
-        )
-        .map((dist) => ({
-          dataset,
-          dist,
-          url: patchUrl(new URL(dist.downloadURL)),
-          outputPath,
-          attempts: 0,
-        }))
-    );
+    let jobs = jobsFromDataset(parsed.dataset, onError, outputPath);
+    if (filterJobs) jobs = jobs.filter(filterJobs);
     const totalJobs = jobs.length;
 
     // por las dudas verificar que no hayan archivos duplicados
@@ -89,13 +104,11 @@ async function downloadFromData(target) {
         try {
           return await downloadDistWithRetries(job);
         } catch (error) {
-          errorFile.write(JSON.stringify(encodeError(job, error)) + "\n");
-          nErrors++;
+          onError(encodeError(job, error));
         } finally {
           nFinished++;
         }
       },
-      // en realidad está limitado por el balancedpool
       { concurrency: 32 }
     );
 
@@ -114,6 +127,40 @@ async function downloadFromData(target) {
   }
 }
 
+/**
+ * @param {import("common/schema.js").Dataset[]} datasets
+ * @param {(err: ReturnType<typeof encodeError>) => void} onError
+ * @param {string} outputPath
+ * @returns {DownloadJob[]}
+ */
+function jobsFromDataset(datasets, onError, outputPath) {
+  return datasets.flatMap((dataset) =>
+    dataset.distribution
+      .filter(
+        /** @returns {dist is import("common/schema.js").Distribution & {downloadURL: string}} */
+        (dist) => {
+          try {
+            if (!dist.downloadURL) {
+              throw new Error("No downloadURL in distribution");
+            }
+            patchUrl(new URL(dist.downloadURL));
+            return true;
+          } catch (error) {
+            onError(encodeError({ dataset, dist }, error));
+            return false;
+          }
+        }
+      )
+      .map((dist) => ({
+        dataset,
+        dist,
+        url: patchUrl(new URL(dist.downloadURL)),
+        outputPath,
+        attempts: 0,
+      }))
+  );
+}
+
 /**
  * @param {Target} target
  * @returns {Promise<string>}
@@ -197,6 +244,7 @@ function hasDuplicates(array) {
 /**
  * @param {{ dataset: import("common/schema.js").Dataset, dist: import("common/schema.js").Distribution, url?: URL }} job
  * @param {any} error
+ * @returns {import("common/schema.js").DumpError}
  */
 function encodeError(job, error) {
   const always = {