diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b02ee6bf..0382a192 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -17,7 +17,7 @@ repos:
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.7.0
+    rev: v3.8.0
     hooks:
       - id: pyupgrade
         args: ["--py37-plus", "--keep-percent-format"]
diff --git a/constructor/nsis/main.nsi.tmpl b/constructor/nsis/main.nsi.tmpl
index 83baca6e..a49ebfc7 100644
--- a/constructor/nsis/main.nsi.tmpl
+++ b/constructor/nsis/main.nsi.tmpl
@@ -66,6 +66,8 @@ Unicode "true"
                    \Uninstall\${UNINSTALL_NAME}"
 
 var /global INSTDIR_JUSTME
+var /global INSTALLER_VERSION
+var /global INSTALLER_NAME_FULL
 
 # UAC shield overlay
 !ifndef BCM_SETSHIELD
@@ -1199,10 +1201,36 @@ Section "Uninstall"
     #   carefully.  More info at https://docs.conda.io/projects/conda/en/latest/user-guide/troubleshooting.html#solution
     System::Call 'kernel32::SetEnvironmentVariable(t,t)i("CONDA_DLL_SEARCH_MODIFICATION_ENABLE", "1").r0'
 
+    # Read variables the uninstaller needs from the registry
+    StrCpy $R0 "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"
+    StrLen $R1 "Uninstall-${NAME}.exe"
+    IntOp $R1 $R1 + 3
+    StrCpy $0 0
+    loop_path:
+        EnumRegKey $1 SHCTX $R0 $0
+        StrCmp $1 "" endloop_path
+        StrCpy $2 "$R0\$1"
+        ReadRegStr $4 SHCTX $2 "UninstallString"
+        StrLen $5 $4
+        IntOp $5 $5 - $R1
+        StrCpy $4 $4 $5 1
+        ${If} $4 == $INSTDIR
+            StrCpy $INSTALLER_NAME_FULL $1
+            ReadRegStr $INSTALLER_VERSION SHCTX $2 "DisplayVersion"
+            goto endloop_path
+        ${EndIf}
+        IntOp $0 $0 + 1
+        goto loop_path
+    endloop_path:
+
     # Extra info for pre_uninstall scripts
     System::Call 'kernel32::SetEnvironmentVariable(t,t)i("PREFIX", "$INSTDIR").r0'
     System::Call 'kernel32::SetEnvironmentVariable(t,t)i("INSTALLER_NAME", "${NAME}").r0'
-    System::Call 'kernel32::SetEnvironmentVariable(t,t)i("INSTALLER_VER", "${VERSION}").r0'
+    StrCpy $0 ${VERSION}
+    ${If} $INSTALLER_VERSION != ""
+	StrCpy $0 $INSTALLER_VERSION
+    ${EndIf}
+    System::Call 'kernel32::SetEnvironmentVariable(t,t)i("INSTALLER_VER", "$0").r0'
     System::Call 'kernel32::SetEnvironmentVariable(t,t)i("INSTALLER_PLAT", "${PLATFORM}").r0'
     System::Call 'kernel32::SetEnvironmentVariable(t,t)i("INSTALLER_TYPE", "EXE").r0'
 
@@ -1216,13 +1244,26 @@ Section "Uninstall"
     # In case the last command fails, run the slow method to remove leftover
     RMDir /r /REBOOTOK "$INSTDIR"
 
-    DeleteRegKey SHCTX "${UNINSTREG}"
+    ${If} $INSTALLER_NAME_FULL != ""
+        DeleteRegKey SHCTX "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\$INSTALLER_NAME_FULL"
+    ${EndIf}
+
     # If Anaconda was registered as the official Python for this version,
     # remove it from the registry
-    ReadRegStr $0 SHCTX "Software\Python\PythonCore\${PY_VER}\InstallPath" ""
-    ${If} $0 == "$INSTDIR"
-        DeleteRegKey SHCTX "Software\Python\PythonCore\${PY_VER}"
-    ${EndIf}
+    StrCpy $R0 "SOFTWARE\Python\PythonCore"
+    StrCpy $0 0
+    loop_py:
+        EnumRegKey $1 SHCTX $R0 $0
+        StrCmp $1 "" endloop_py
+        ReadRegStr $2 SHCTX "$R0\$1\InstallPath" ""
+        ${If} $2 == $INSTDIR
+            StrCpy $R1 $1
+            DeleteRegKey SHCTX "$R0\$1"
+            goto endloop_py
+        ${EndIf}
+        IntOp $0 $0 + 1
+        goto loop_py
+    endloop_py:
 SectionEnd
 
 !if '@SIGNTOOL_COMMAND@' != ''
diff --git a/constructor/preconda.py b/constructor/preconda.py
index a480b8bd..35fef41d 100644
--- a/constructor/preconda.py
+++ b/constructor/preconda.py
@@ -139,8 +139,11 @@ def write_files(info, dst_dir):
 
     with open(join(dst_dir, 'urls'), 'w') as fo:
         for url, md5 in all_final_urls_md5s:
-            url = ensure_transmuted_ext(info, url)
-            fo.write('%s#%s\n' % (url, md5))
+            maybe_different_url = ensure_transmuted_ext(info, url)
+            if maybe_different_url != url:  # transmuted, no md5
+                fo.write(f"{maybe_different_url}\n")
+            else:
+                fo.write(f"{url}#{md5}\n")
 
     with open(join(dst_dir, 'urls.txt'), 'w') as fo:
         for url, _ in all_final_urls_md5s:
@@ -247,7 +250,12 @@ def write_env_txt(info, dst_dir, urls):
     ).lstrip()
     with open(join(dst_dir, "env.txt"), "w") as envf:
         envf.write(header)
-        envf.write('\n'.join([f"{url}#{md5}" for url, md5 in urls]))
+        for url, md5 in urls:
+            maybe_different_url = ensure_transmuted_ext(info, url)
+            if maybe_different_url != url:  # transmuted, no md5
+                envf.write(f"{maybe_different_url}\n")
+            else:
+                envf.write(f"{url}#{md5}\n")
 
 
 def write_channels_txt(info, dst_dir, env_config):
diff --git a/news/684-uninstaller-check-registry b/news/684-uninstaller-check-registry
new file mode 100644
index 00000000..9b13d7c9
--- /dev/null
+++ b/news/684-uninstaller-check-registry
@@ -0,0 +1,19 @@
+### Enhancements
+
+* The Windows uninstaller will check the registry for `$INSTDIR` before deleting hardcoded registry keys (#684)
+
+### Bug fixes
+
+* <news item>
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>
diff --git a/news/692-micromamba-transmutation b/news/692-micromamba-transmutation
new file mode 100644
index 00000000..d560de12
--- /dev/null
+++ b/news/692-micromamba-transmutation
@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Adjust `@EXPLICIT` input file so that `micromamba` correctly finds the cache entries of transmuted packages. (#674 via #692)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>