If bundles are not available to download through the SDDC Manager UI, you may need to download the bundles through the SDDC Manager API.
VMware Cloud Foundation 5.x
SSH to SDDC Manager using vcf and su to root
curl -X POST -H "Content-Type: application/json" -d '{"username": "<sso_username>","password": "<sso_password>"}' https://<sddc_manager_IP>/v1/tokens | json_pp
curl -k 'https://<sddc_manager_IP>/v1/bundles/<bundle id gathered from Step # 2>' -i -X PATCH \
-H 'Content-Type: application/json' \
-H 'Accept: application/json' \
-H 'Authorization: Bearer <TOKEN receievd from Step # 1>' \
-d '{
"bundleDownloadSpec" : {
"downloadNow" : true
}
}'