diff --git a/OATFWGUI/gui_logic.py b/OATFWGUI/gui_logic.py
index 820951c..d91dba0 100644
--- a/OATFWGUI/gui_logic.py
+++ b/OATFWGUI/gui_logic.py
@@ -1,3 +1,4 @@
+import os
 import re
 import logging
 import sys
@@ -18,13 +19,13 @@
 from external_processes import external_processes, get_install_dir
 from gui_state import LogicState, PioEnv, FWVersion
 from anon_usage_data import AnonStatsDialog, create_anon_stats, upload_anon_stats
-from misc_utils import delete_directory
+from misc_utils import delete_directory, get_env_var
 
 log = logging.getLogger('')
 
 
 def read_platformio_ini_file(logic_state: LogicState) -> List[str]:
-    ini_path = Path(logic_state.fw_dir, 'platformio.ini')
+    ini_path = Path(os.path.expandvars(logic_state.fw_dir), 'platformio.ini')
     with open(ini_path.resolve(), 'r') as fp:
         ini_lines = fp.readlines()
     return ini_lines
@@ -48,6 +49,7 @@ def get_pio_environments(ini_lines: List[str]) -> List[PioEnv]:
         'mksgenlv21': 'MKS Gen L v2.1',
         'mksgenlv2': 'MKS Gen L v2',
         'mksgenlv1': 'MKS Gen L v1',
+        'oaeboardv1': 'OAE Board v1',
     }
     pio_environments = []
     for raw_env in raw_pio_envs:
@@ -69,8 +71,10 @@ def download_fw(zip_url: str) -> Path:
 
 def extract_fw(zipfile_name: Path) -> Path:
     # For Windows path length reasons, keep the firmware folder name short
-    fw_dir = Path(get_install_dir(), 'OATFW')
-    if fw_dir.exists():
+    fw_dir_env = Path(get_env_var('INSTALL_DIR'), 'OATFW')
+    fw_dir = os.path.expandvars(fw_dir_env)
+    
+    if Path(fw_dir).exists():
         log.info(f'Removing previously downloaded FW from {fw_dir}')
         delete_directory(fw_dir)
 
@@ -87,7 +91,7 @@ def extract_fw(zipfile_name: Path) -> Path:
     log.info(f'Rename {extracted_dir} to {fw_dir}')
     shutil.move(extracted_dir, fw_dir)
     log.info(f'Extracted FW to {fw_dir}')
-    return fw_dir
+    return fw_dir_env
 
 
 class BusinessLogic:
@@ -169,6 +173,8 @@ def get_fw_versions(self) -> str:
         releases_list = [
             FWVersion('develop',
                       'https://github.com/OpenAstroTech/OpenAstroTracker-Firmware/archive/refs/heads/develop.zip'),
+            FWVersion('oae-fw',
+                      'https://github.com/OpenAstroTech/OpenAstroTracker-Firmware/archive/refs/heads/oae-fw.zip'),
         ]
         if r.status_code != requests.codes.ok:
             log.error(f'Failed to grab latest FW versions: {r.status_code} {r.reason} {r.text}')
@@ -307,7 +313,7 @@ def build_fw(self):
         # Hot patches, since we can't re-release an old firmware tag
         self.do_hot_patches()
 
-        config_dest_path = str(Path(self.logic_state.fw_dir, 'Configuration_local.hpp').resolve())
+        config_dest_path = str(Path(os.path.expandvars(self.logic_state.fw_dir), 'Configuration_local.hpp').resolve())
         if Path(config_dest_path) != Path(self.logic_state.config_file_path):
             if QFile.exists(config_dest_path):
                 log.warning(f'Deleting existing configuration file {config_dest_path}')
diff --git a/OATFWGUI/main.py b/OATFWGUI/main.py
index 790585f..8c86dc4 100755
--- a/OATFWGUI/main.py
+++ b/OATFWGUI/main.py
@@ -48,6 +48,7 @@ def check_and_warn_directory_path_length(dir_to_check: Path, max_path_len: int,
 def setup_environment():
     install_dir = get_install_dir()
     log.debug(f'Install dir is {install_dir}')
+    os.environ['INSTALL_DIR'] = str(install_dir)
     if get_platform() == PlatformEnum.WINDOWS:
         # With 54fa285a dependencies the maximum path length is 180.
         # 260-152=108, but derate to 100 (for possible future increases)
diff --git a/OATFWGUI/misc_utils.py b/OATFWGUI/misc_utils.py
index 843174b..dab5a60 100644
--- a/OATFWGUI/misc_utils.py
+++ b/OATFWGUI/misc_utils.py
@@ -4,6 +4,7 @@
 import logging
 from pathlib import Path
 from typing import Callable
+from platform_check import get_platform, PlatformEnum
 
 log = logging.getLogger('')
 
@@ -21,3 +22,11 @@ def remove_readonly(func: Callable, path, excinfo):
 def decode_bytes(byte_string: bytes) -> str:
     # Just to consolidate all text decoding and make sure they're all the same
     return byte_string.decode('utf-8', errors='backslashreplace')
+
+def get_env_var(env_var) -> str:
+    if get_platform() == PlatformEnum.WINDOWS:
+        # Use %MY_PATH% syntax
+        return f'%{env_var}%'
+    else:
+        # Use $MY_PATH syntax
+        return os.path.expandvars(f'${env_var}')
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