diff --git a/scripts/windows/build-conda-installer.sh b/scripts/windows/build-conda-installer.sh
index f1658fe0b2d..a214cedbecd 100755
--- a/scripts/windows/build-conda-installer.sh
+++ b/scripts/windows/build-conda-installer.sh
@@ -4,11 +4,11 @@
 set -e
 
 function usage() {
-    echo 'build-conda-installer.sh
+    echo "build-conda-installer.sh
 
 Build a conda based based windows application installer.
 
-Note: This script needs makensis and curl on $PATH
+Note: This script needs makensis and curl on \$PATH
 Note: Needs basic bash env on Windows (git-bash is sufficient/tested, but
       cygwin should work too)
 
@@ -16,12 +16,15 @@ Options:
     -b --build-base <path>  Build directory (default ./build)
     -d --dist-dir <path>    Distribution dir (default ./dist)
     --cache-dir <path>      Cache downloaded packages in DIR (the default
-                            is "build/download-cache")
+                            is \"build/download-cache\")
+    -M, --miniconda-version <version>
+                            The miniconda distribution to include in the
+                            installer (default ${MINICONDA_VERSION_DEFAULT}).
     --platform <plattag>    win32 or win_amd64
     --env-spec              An environment specification file as exported by
-                            `conda list --export --explicit --md5`
+                            \`conda list --export --explicit --md5\`
                             (the default is specs/conda-spec.txt)
-    --online (yes|no)       Build an "online" or "offline" installer.
+    --online (yes|no)       Build an \"online\" or \"offline\" installer.
                             In an online installer only the Miniconda installer
                             is included. All other packages are otherwise
                             fetched at installation time
@@ -32,21 +35,21 @@ Options:
 Examples
 
     $ ./scripts/windows/build-conda-installer.sh --online=yes
-'
+"
 }
 
 NAME=Orange3
 # version is determined from the ENV_SPEC_FILE
 VERSION=
 
-PYTHON=
 BUILDBASE=
 DISTDIR=
 CACHEDIR=
 
-# Python version in the Miniconda installer.
-MINICONDA_VERSION=4.7.12
-PYTHON_VERSION=3.7.0
+# Miniconda installer version; included and installed if there is no existing
+# Anaconda/Miniconda installation found on the target system.
+MINICONDA_VERSION_DEFAULT=4.7.12
+MINICONDA_VERSION=${MINICONDA_VERSION_DEFAULT}
 
 PLATTAG=win_amd64
 
@@ -71,6 +74,10 @@ while [[ "${1:0:1}" = "-" ]]; do
             CACHEDIR=${2:?}; shift 2;;
         --cache-dir=*)
             CACHEDIR=${1#*=}; shift 1;;
+        -M|--miniconda-version)
+            MINICONDA_VERSION=${2:?}; shift 2;;
+        --miniconda-version=*)
+            MINICONDA_VERSION=${1*=}; shift 1;;
         --platform)
             PLATTAG=${2:?}; shift 2;;
         --platform=*)
@@ -90,10 +97,6 @@ while [[ "${1:0:1}" = "-" ]]; do
      esac
 done
 
-if [[ ! ${PYTHON_VERSION} =~ ^([0-9]+\.){2,}[0-9]+$ ]]; then
-    echo "Invalid python version: $PYTHON_VERSION (need major.minor.micro)" >&2
-    exit 1
-fi
 
 if [[ ! ${PLATTAG:?} =~ (win32|win_amd64) ]]; then
     echo "Invalid platform tag: ${PLATTAG} (expected win32 or win_amd64)" >&2
@@ -106,10 +109,6 @@ if [[ ! "${ONLINE}" =~ ^(yes|no)$ ]]; then
     exit 1
 fi
 
-# Major.Minor
-PYTHON_VER=${PYTHON_VERSION%.*}
-# MajorMinor
-PYTAG=${PYTHON_VER/./}
 
 if [[ ${PLATTAG} == win32 ]]; then
     CONDAPLATTAG=x86
@@ -119,7 +118,7 @@ fi
 
 
 BUILDBASE=${BUILDBASE:-./build}
-BASEDIR="${BUILDBASE:?}"/temp.${PLATTAG}-${PYTHON_VER}.conda-installer
+BASEDIR="${BUILDBASE:?}"/temp.${PLATTAG}.conda-installer
 
 CACHEDIR=${CACHEDIR:-./build/download-cache}
 DISTDIR=${DISTDIR:-./dist}
@@ -185,6 +184,14 @@ fetch-miniconda() {
     fi
 }
 
+
+# extract Mayor.Minor.Micro python version string from a conda env spec file
+# contents read from stdin
+conda-env-spec-python-version() {
+    grep -E "(^|.+/)python-(\d+.\d+.\d+)" | sed -n 's@.*python-\([^-]*\)-.*$@\1@p'
+}
+
+
 # $ conda-fetch-packages DESTDIR SPECFILE
 #
 # Given an conda env spec (as exported by `conda list --explicit`),
@@ -311,9 +318,9 @@ make-installer() {
     local major=$(version-component 1 "${versionstr}")
     local minor=$(version-component 2 "${versionstr}")
     local micro=$(version-component 3 "${versionstr}")
-    local pymajor=$(version-component 1 "${PYTHON_VERSION}")
-    local pyminor=$(version-component 2 "${PYTHON_VERSION}")
-    local pymicro=$(version-component 3 "${PYTHON_VERSION}")
+    local pymajor=$(version-component 1 "${PYTHON_VERSION:?}")
+    local pyminor=$(version-component 2 "${PYTHON_VERSION:?}")
+    local pymicro=$(version-component 3 "${PYTHON_VERSION:?}")
 
     cat <<EOF > "${BASEDIR}"/license.txt
 Acknowledgments and License Agreement
@@ -355,12 +362,16 @@ if [[ "${ONLINE}" == yes ]]; then
     VERSION=$(cat < "${BASEDIR}"/conda-spec.txt |
               grep -E 'orange3-.*tar.bz2' |
               sed -e 's@^.*orange3-\([^-]*\)-.*tar.bz2.*@\1@')
+    PYTHON_VERSION=$(conda-env-spec-python-version \
+                     < "${BASEDIR:?}"/conda-spec.txt)
 else
     conda-fetch-packages "${BASEDIR:?}"/conda-pkgs "${ENV_SPEC_FILE}"
     # extract the orange version from env spec
     VERSION=$(cat < "${BASEDIR:?}"/conda-pkgs/conda-spec.txt |
               grep -E 'orange3-.*tar.bz2' |
               cut -d "-" -f 2)
+    PYTHON_VERSION=$(conda-env-spec-python-version \
+                     < "${BASEDIR:?}"/conda-pkgs/conda-spec.txt)
 fi
 
 if [[ ! "${VERSION}" ]]; then
diff --git a/scripts/windows/orange-conda.nsi b/scripts/windows/orange-conda.nsi
index 75041e0bbf6..2ee285beaa6 100644
--- a/scripts/windows/orange-conda.nsi
+++ b/scripts/windows/orange-conda.nsi
@@ -5,7 +5,7 @@
 # Required definitions need to be passed to the makensis call
 #  - BASEDIR base location of all required files, ... (see below)
 #  - PYARCH python architecture identifier (win32 or amd64)
-#  - PY{MAJOR,MINOR,MICRO} Python version of the included installer
+#  - PY{MAJOR,MINOR,MICRO} Python version to be installed in the new env
 #  - APPNAME Application (short) name
 #  - VER{MAJOR,MINOR,MICRO} Application version
 #  - PYINSTALLER basename of the Miniconda python installer
@@ -362,7 +362,7 @@ Function DirectoryLeave
         ${Else}
             ${LogWrite} "$InstDir is not empty, aborting"
             MessageBox MB_OK '"$InstDir" exists and is not empty.$\r$\n \
-                              Please choose annother destination folder.'
+                              Please choose another destination folder.'
             Abort '"$InstDir" exists an is not empty'
         ${EndIf}
     ${EndIf}
@@ -384,7 +384,7 @@ FunctionEnd
 # Section Miniconda
 # -----------------
 # A Miniconda Python distributions
-Section "Miniconda ${MINICONDA_VERSION} (Python ${PYTHON_VERSION} ${BITS}-bit)" \
+Section "Miniconda ${MINICONDA_VERSION}" \
         SectionMiniconda
     ${GetAnyAnacondaInstall} $BasePythonPrefix $PythonInstallMode
     ${If} $BasePythonPrefix != ""
@@ -407,10 +407,7 @@ Section "Miniconda ${MINICONDA_VERSION} (Python ${PYTHON_VERSION} ${BITS}-bit)"
         ${If} $0 != 0
             Abort "Miniconda installation failed (error value: $0)"
         ${EndIf}
-
-        ${GetAnacondaInstall} ${PYMAJOR}${PYMINOR} ${BITS} \
-                          $BasePythonPrefix $PythonInstallMode
-
+        ${GetAnyAnacondaInstall} $BasePythonPrefix $PythonInstallMode
         ${IfNot} ${FileExists} "$BasePythonPrefix\python.exe"
             Abort "No python.exe found in $BasePythonPrefix$\r$\n \
                    Cannot continue."