Ricky Martin gave kudos to Marcos in Upgrading to ESET Protect server?
If you back up the db and export both CA and peer certificates, you should be able to install ESMC 7.2 from scratch and restore the db and import certificates.
However, we recommend upgrading to ESET PROTECT since ESMC 7.2 is already in limited support:
Ricky Martin gave kudos to Peter Randziak in Primary profile update failed using ERA 7.2
Hello @Ricky Martin
I would bet, you have the "Create update mirror" option enabled, causing the update to be so large.
Disable that option and the download will be significantly smaller.
Note that the initial download will still be quite large, but the incremental ones will be very small, as Marcos already mentioned.