SDDC Manager 5.x
1. Check the LCM log and make sure there is not crash error message.
2. Search the keyword in the lcm-debug.log
zgrep BundleManifestDownloadScheduler *debug*|more
DEBUG [vcf_lcm,695c6a8c06e694d64faafb2631d3a42d,425f] [c.v.e.s.l.c.s.BundleManifestDownloadScheduler,vac-scheduler-1] Manifest polling is not enabled
DEBUG [vcf_lcm,695c6bb8dfbac783455bf7da66aded6b,0445] [c.v.e.s.l.c.s.BundleManifestDownloadScheduler,vac-scheduler-1] Starting Bundle Manifest download
DEBUG [vcf_lcm,695c6bb8dfbac783455bf7da66aded6b,0445] [c.v.e.s.l.c.s.BundleManifestDownloadScheduler,vac-scheduler-1] Manifest polling is not enabled
DEBUG [vcf_lcm,695c6ce4d4e02f5e4f8d3d344a045ea3,ed0d] [c.v.e.s.l.c.s.BundleManifestDownloadScheduler,vac-scheduler-1] Starting Bundle Manifest download
DEBUG [vcf_lcm,695c6ce4d4e02f5e4f8d3d344a045ea3,ed0d] [c.v.e.s.l.c.s.BundleManifestDownloadScheduler,vac-scheduler-1] Manifest polling is not enabled
DEBUG [vcf_lcm,695c6e103f76fcce6e1a31c782c4060e,74b4] [c.v.e.s.l.c.s.BundleManifestDownloadScheduler,vac-scheduler-1] Starting Bundle Manifest download
DEBUG [vcf_lcm,695c6e103f76fcce6e1a31c782c4060e,74b4] [c.v.e.s.l.c.s.BundleManifestDownloadScheduler,vac-scheduler-1] Manifest polling is not enabled
DEBUG [vcf_lcm,695c6f3c0b681e07af307c783d7e74a3,5d11] [c.v.e.s.l.c.s.BundleManifestDownloadScheduler,vac-scheduler-1] Starting Bundle Manifest download
3. Check the enableManifestPolling value
cat /opt/vmware/vcf/lcm/lcm-app/conf/application-prod.properties |grep -i polling
lcm.core.enableManifestPolling=false
4. If it's false, please set it back to true
5. Restart LCM service
systemctl restart lcm
https://knowledge.broadcom.com/external/article/412762/download-bundles-are-not-available-in-sd.html