diff --git a/launcher/modplatform/flame/FlameInstanceCreationTask.cpp b/launcher/modplatform/flame/FlameInstanceCreationTask.cpp
index ef552c3c2..a1f10c156 100644
--- a/launcher/modplatform/flame/FlameInstanceCreationTask.cpp
+++ b/launcher/modplatform/flame/FlameInstanceCreationTask.cpp
@@ -537,7 +537,12 @@ void FlameCreationTask::setupDownloadJob(QEventLoop& loop)
         selectedOptionalMods = optionalModDialog.getResult();
     }
     for (const auto& result : results) {
-        auto relpath = FS::PathCombine(result.targetFolder, result.fileName);
+        auto fileName = result.fileName;
+#ifdef Q_OS_WIN
+        fileName = FS::RemoveInvalidPathChars(fileName);
+#endif
+        auto relpath = FS::PathCombine(result.targetFolder, fileName);
+
         if (!result.required && !selectedOptionalMods.contains(relpath)) {
             relpath += ".disabled";
         }
diff --git a/launcher/modplatform/flame/FlameModIndex.cpp b/launcher/modplatform/flame/FlameModIndex.cpp
index 345883c17..83a28fa2b 100644
--- a/launcher/modplatform/flame/FlameModIndex.cpp
+++ b/launcher/modplatform/flame/FlameModIndex.cpp
@@ -1,5 +1,6 @@
 #include "FlameModIndex.h"
 
+#include "FileSystem.h"
 #include "Json.h"
 #include "minecraft/MinecraftInstance.h"
 #include "minecraft/PackProfile.h"
@@ -138,6 +139,9 @@ auto FlameMod::loadIndexedPackVersion(QJsonObject& obj, bool load_changelog) ->
     file.version = Json::requireString(obj, "displayName");
     file.downloadUrl = Json::ensureString(obj, "downloadUrl");
     file.fileName = Json::requireString(obj, "fileName");
+#ifdef Q_OS_WIN
+    file.fileName = FS::RemoveInvalidPathChars(file.fileName);
+#endif
 
     ModPlatform::IndexedVersionType::VersionType ver_type;
     switch (Json::requireInteger(obj, "releaseType")) {
diff --git a/launcher/modplatform/modrinth/ModrinthInstanceCreationTask.cpp b/launcher/modplatform/modrinth/ModrinthInstanceCreationTask.cpp
index a688cea87..3b875103b 100644
--- a/launcher/modplatform/modrinth/ModrinthInstanceCreationTask.cpp
+++ b/launcher/modplatform/modrinth/ModrinthInstanceCreationTask.cpp
@@ -240,11 +240,15 @@ bool ModrinthCreationTask::createInstance()
     auto root_modpack_url = QUrl::fromLocalFile(root_modpack_path);
 
     for (auto file : m_files) {
-        auto file_path = FS::PathCombine(root_modpack_path, file.path);
+        auto fileName = file.path;
+#ifdef Q_OS_WIN
+        fileName = FS::RemoveInvalidPathChars(fileName);
+#endif
+        auto file_path = FS::PathCombine(root_modpack_path, fileName);
         if (!root_modpack_url.isParentOf(QUrl::fromLocalFile(file_path))) {
             // This means we somehow got out of the root folder, so abort here to prevent exploits
             setError(tr("One of the files has a path that leads to an arbitrary location (%1). This is a security risk and isn't allowed.")
-                         .arg(file.path));
+                         .arg(fileName));
             return false;
         }
 
diff --git a/launcher/modplatform/modrinth/ModrinthPackIndex.cpp b/launcher/modplatform/modrinth/ModrinthPackIndex.cpp
index c1c30ab5f..4671a330d 100644
--- a/launcher/modplatform/modrinth/ModrinthPackIndex.cpp
+++ b/launcher/modplatform/modrinth/ModrinthPackIndex.cpp
@@ -17,6 +17,7 @@
  */
 
 #include "ModrinthPackIndex.h"
+#include "FileSystem.h"
 #include "ModrinthAPI.h"
 
 #include "Json.h"
@@ -226,6 +227,9 @@ auto Modrinth::loadIndexedPackVersion(QJsonObject& obj, QString preferred_hash_t
     if (parent.contains("url")) {
         file.downloadUrl = Json::requireString(parent, "url");
         file.fileName = Json::requireString(parent, "filename");
+#ifdef Q_OS_WIN
+        file.fileName = FS::RemoveInvalidPathChars(file.fileName);
+#endif
         file.is_preferred = Json::requireBoolean(parent, "primary") || (files.count() == 1);
         auto hash_list = Json::requireObject(parent, "hashes");
 
diff --git a/launcher/net/HttpMetaCache.cpp b/launcher/net/HttpMetaCache.cpp
index f37bc0bf8..648155412 100644
--- a/launcher/net/HttpMetaCache.cpp
+++ b/launcher/net/HttpMetaCache.cpp
@@ -84,6 +84,9 @@ auto HttpMetaCache::getEntry(QString base, QString resource_path) -> MetaEntryPt
 
 auto HttpMetaCache::resolveEntry(QString base, QString resource_path, QString expected_etag) -> MetaEntryPtr
 {
+#ifdef Q_OS_WIN
+    resource_path = FS::RemoveInvalidPathChars(resource_path);
+#endif
     auto entry = getEntry(base, resource_path);
     // it's not present? generate a default stale entry
     if (!entry) {
diff --git a/launcher/net/NetRequest.cpp b/launcher/net/NetRequest.cpp
index 728c0e077..526fe77a5 100644
--- a/launcher/net/NetRequest.cpp
+++ b/launcher/net/NetRequest.cpp
@@ -68,7 +68,8 @@ void NetRequest::executeTask()
 
     if (getState() == Task::State::AbortedByUser) {
         qCWarning(logCat) << getUid().toString() << "Attempt to start an aborted Request:" << m_url.toString();
-        emitAborted();
+        emit aborted();
+        emit finished();
         return;
     }
 
@@ -85,10 +86,12 @@ void NetRequest::executeTask()
             break;
         case State::Inactive:
         case State::Failed:
-            emitFailed();
+            emit failed("Failed to initilize sink");
+            emit finished();
             return;
         case State::AbortedByUser:
-            emitAborted();
+            emit aborted();
+            emit finished();
             return;
     }