diff --git a/resources/standards-data/ldml-keyboards/45/fetch-latest-cldr.sh b/resources/standards-data/ldml-keyboards/fetch-latest-cldr.sh
old mode 100755
new mode 100644
similarity index 53%
rename from resources/standards-data/ldml-keyboards/45/fetch-latest-cldr.sh
rename to resources/standards-data/ldml-keyboards/fetch-latest-cldr.sh
index e12c8f8cbc..7234c69fb9
--- a/resources/standards-data/ldml-keyboards/45/fetch-latest-cldr.sh
+++ b/resources/standards-data/ldml-keyboards/fetch-latest-cldr.sh
@@ -7,25 +7,43 @@
 
 set -eu
 
-if [[ $# -ne 1 ]];
+if [[ $# -ne 2 ]];
 then
-    echo >&2 "Usage: $0 <cldr-dir>"
+    echo >&2 "Usage: $0 <cldr-major> <cldr-dir>"
     exit 1
 fi
 
 ## START STANDARD BUILD SCRIPT INCLUDE
 # adjust relative paths as necessary
 THIS_SCRIPT="$(readlink -f "${BASH_SOURCE[0]}")"
-. "${THIS_SCRIPT%/*}/../../../../resources/build/build-utils.sh"
+. "${THIS_SCRIPT%/*}/../../../resources/build/build-utils.sh"
 ## END STANDARD BUILD SCRIPT INCLUDE
 
 . "$KEYMAN_ROOT/resources/build/jq.inc.sh"
 
 cd "$THIS_SCRIPT_PATH"
 
+KEYMAN_CORE_LDML="../../../core/include/ldml"
+
+builder_echo debug "Building ${KEYMAN_CORE_LDML}"
+
+"${KEYMAN_CORE_LDML}/build.sh" || builder_die "building core/include/ldml failed"
+
+KEYMAN_CORE_LDML_JS="${KEYMAN_CORE_LDML}/build/keyman_core_ldml.js"
+
+if [ ! -f "${KEYMAN_CORE_LDML_JS}" ];
+then
+    builder_die "Could not read ${KEYMAN_CORE_LDML_JS} - check build."
+fi
+
+CLDR_VERSION="$1"
+shift
+
 CLDR_DIR="$1"
 shift
 
+node verify-version.mjs "${CLDR_VERSION}" || builder_die "Check CLDR version"
+
 KEYBOARDS_DIR="${CLDR_DIR}/keyboards"
 DTD_DIR="${KEYBOARDS_DIR}/dtd"
 IMPORT_DIR="${KEYBOARDS_DIR}/import"
@@ -51,8 +69,15 @@ GIT_DESCRIBE=$(cd "${CLDR_DIR}" && git describe HEAD || echo unknown)
 GIT_SHA=$(cd "${CLDR_DIR}" && git rev-parse HEAD || echo unknown)
 NOW=$(date -u -R)
 
-echo "${CLDR_DIR}" - "${GIT_DESCRIBE}" - "${GIT_SHA}"
-echo "---"
+
+builder_echo heading "Ready to copy v${CLDR_VERSION} from ${CLDR_DIR}"
+builder_echo debug "${GIT_DESCRIBE} - ${GIT_SHA}"
+
+mkdir -pv "${CLDR_VERSION}"
+
+cd "${CLDR_VERSION}"
+
+pwd
 
 # delete the old files in case some were removed from CLDR
 rm -rf ./import ./3.0 ./dtd ./test
@@ -64,19 +89,32 @@ rm -vf dtd/{ldmlKeyboard,ldmlPlatform}.{xsd,dtd}
 
 
 echo "{\"sha\": \"${GIT_SHA}\",\"description\":\"${GIT_DESCRIBE}\",\"date\":\"${NOW}\"}" | ${JQ} . | tee cldr_info.json
-echo "Updated cldr_info.json"
+builder_echo "Updated cldr_info.json"
 
-echo "Converting XSD to JSON…"
+builder_echo heading "Converting XSD to JSON…"
 
 for xsd in dtd/*.xsd;
 do
     base=$(basename "${xsd}" .xsd | tr A-Z a-z | sed -e 's%^ldml%ldml-%g' )
     json=${base}.schema.json
-    echo "${xsd} -> ${json}"
-    (cd .. ; npx -p  jgexml xsd2json 45/"${xsd}" 45/"${json}") || exit
-    echo 'fixup-schema.js' "${json}"
-    node fixup-schema.js "${json}" || builder_die "failed to fixup schema ${json}"
+    builder_echo debug "${xsd} -> ${json}"
+    (cd .. ; npx -p  jgexml xsd2json ${CLDR_VERSION}/"${xsd}" ${CLDR_VERSION}/"${json}") || exit
+    builder_echo debug 'fixup-schema.js' "${json}"
+    node ../fixup-schema.js "${json}" || builder_die "failed to fixup schema ${json}"
     mv "${json}" tmp.json
     ${JQ} . -S < tmp.json > "${json}" || (rm tmp.json ; builder_die "failed to transform final schema ${json}")
     rm tmp.json
 done
+
+# verify that the CLDR version we just converted is the requested version.
+FOUND_VERSION=$(jq -r '.definitions.version.properties.cldrVersion.enum[0]' < ldml-keyboard3.schema.json)
+
+if [ ${FOUND_VERSION} -ne ${CLDR_VERSION} ];
+then
+    # It's a little late to cleanup more gracefully, but we can at least complain.
+    builder_die "You requested CLDR ${CLDR_VERSION} but the copied schema is for ${FOUND_VERSION} - something is wrong."
+fi
+
+echo
+builder_echo success "CLDR ${CLDR_VERSION} copied correctly from ${CLDR_DIR}"
+echo
diff --git a/resources/standards-data/ldml-keyboards/45/fixup-schema.js b/resources/standards-data/ldml-keyboards/fixup-schema.js
similarity index 100%
rename from resources/standards-data/ldml-keyboards/45/fixup-schema.js
rename to resources/standards-data/ldml-keyboards/fixup-schema.js
diff --git a/resources/standards-data/ldml-keyboards/readme.md b/resources/standards-data/ldml-keyboards/readme.md
index aec3717571..22189fcfd6 100644
--- a/resources/standards-data/ldml-keyboards/readme.md
+++ b/resources/standards-data/ldml-keyboards/readme.md
@@ -2,6 +2,12 @@
 
 Data is versioned, so each directory has its version such as `45`.
 
+## How to Update
+
+- Checkout CLDR, preferably a release version, somewhere such as /src/cldr
+- run `fetch-latest-cldr.sh 45 /src/cldr`   (where '45' is the CLDR version)
+- check results, run tests, check in and open a PR
+
 ## Data Format
 
 Each directory contains:
diff --git a/resources/standards-data/ldml-keyboards/verify-version.mjs b/resources/standards-data/ldml-keyboards/verify-version.mjs
new file mode 100644
index 0000000000..0704155c93
--- /dev/null
+++ b/resources/standards-data/ldml-keyboards/verify-version.mjs
@@ -0,0 +1,12 @@
+import {constants} from '../../../core/include/ldml/build/keyman_core_ldml.js';
+import { argv } from 'node:process';
+
+const args = argv.slice(2);
+const { cldr_version_latest } = constants;
+const ver = args[0];
+
+if (cldr_version_latest !== ver) {
+    throw Error(`Requester CLDR version '${ver}' but cldr_version_latest is '${cldr_version_latest}' - check keyman_core_ldml.ts`);
+} else {
+    console.log(`CLDR version ${ver} OK`);
+}