Created a separate topic because for some reason I can't answer my own post on the other topic about the availability of an offline install ...
I have been told by support there is no available offline installation for the 2017 products. Too bad ... The only workaround was to perform a full install on a different computer. After installation was completed on that second computer, a "setup" folder was created and it could be (hopefully) copied to finally perform an offline installation on the original target.
Am I missing something? The original 2017 is available from Amazon, ref: https://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=corelcad+2017
These are boxed discs.
The update ( which is sorely needed ) for 2017.5 is a complete redownload, but in fairness, it's been that way since at least CoreCAD2012, and I think even CorelCAD (Original) in 2010/2011 had the same issue.
I don't know if anything will change for 2018, but at the moment, it's still the same.