diff --git a/lnbits/app.py b/lnbits/app.py
index 9fb388c0..b1312fd8 100644
--- a/lnbits/app.py
+++ b/lnbits/app.py
@@ -156,6 +156,14 @@ def register_new_ext_routes(app: FastAPI) -> Callable:
 def register_ext_routes(app: FastAPI, ext: Extension) -> None:
     """Register FastAPI routes for extension."""
     ext_module = importlib.import_module(f"lnbits.extensions.{ext.code}")
+    if ext.version != "":
+        if f"lnbits.extensions.{ext.code}" in sys.modules:
+            del sys.modules[f"lnbits.extensions.{ext.code}"]
+            del ext_module
+            ext_module = importlib.import_module(f"lnbits.upgrades.{ext.version}.{ext.code}-{ext.version}")
+    # else:
+    #     ext_module = importlib.import_module(f"lnbits.extensions.{ext.code}")
+
     ext_route = getattr(ext_module, f"{ext.code}_ext")
 
     if hasattr(ext_module, f"{ext.code}_start"):
@@ -168,7 +176,11 @@ def register_ext_routes(app: FastAPI, ext: Extension) -> None:
             app.mount(s["path"], s["app"], s["name"])
 
     logger.trace(f"adding route for extension {ext_module}")
-    app.include_router(ext_route)
+    if ext.version != "":
+        # ext_route.prefix = "/sss"
+        app.include_router(router=ext_route, prefix="/sss")
+    else:
+        app.include_router(router=ext_route)
 
 
 def register_startup(app: FastAPI):
diff --git a/lnbits/core/views/api.py b/lnbits/core/views/api.py
index 36e8648f..5715ee62 100644
--- a/lnbits/core/views/api.py
+++ b/lnbits/core/views/api.py
@@ -794,16 +794,17 @@ async def api_install_extension(
 
     try:
         ext_dir = os.path.join("lnbits/extensions", ext_id)
-        shutil.rmtree(ext_dir, True)
-        with zipfile.ZipFile(ext_zip_file, "r") as zip_ref:
-            zip_ref.extractall("lnbits/extensions")
+        # shutil.rmtree(ext_dir, True)
+        # with zipfile.ZipFile(ext_zip_file, "r") as zip_ref:
+        #     zip_ref.extractall("lnbits/extensions")
 
         # todo: is admin only
-        ext = Extension(extension.id, True, extension.is_admin_only, extension.name)
+        # lnbits/extensions/satspay/upgrade/111/satspay/__init__.py
+        ext = Extension(code=extension.id, is_valid=True, is_admin_only=False, name=extension.name, version="111")
 
-        current_versions = await get_dbversions()
-        current_version = current_versions.get(ext.code, 0)
-        await migrate_extension_database(ext, current_version)
+        # current_versions = await get_dbversions()
+        # current_version = current_versions.get(ext.code, 0)
+        # await migrate_extension_database(ext, current_version) # todo: test
 
         # disable by default
         await update_user_extension(user_id=USER_ID_ALL, extension=ext_id, active=False)
@@ -818,7 +819,7 @@ async def api_install_extension(
             os.remove(ext_zip_file)
 
         # remove module from extensions
-        shutil.rmtree(ext_dir, True)
+        # shutil.rmtree(ext_dir, True)
         raise HTTPException(
             status_code=HTTPStatus.INTERNAL_SERVER_ERROR, detail=str(ex)
         )
diff --git a/lnbits/helpers.py b/lnbits/helpers.py
index 52a7f6ab..346ebc1b 100644
--- a/lnbits/helpers.py
+++ b/lnbits/helpers.py
@@ -25,6 +25,7 @@ class Extension(NamedTuple):
     hidden: bool = False
     migration_module: Optional[str] = None
     db_name: Optional[str] = None
+    version: Optional[str] = ""
 
 
 class ExtensionManager: