Thank you for replying, sorry our solutions did not solve the issue.

If the game works fine on another laptop, then it may be something localized to that computer that is having the issue. Are there any major differences in the computers (Operating Systems, Connection types, brands/models)?

If you have not tried connecting directly into the modem or the Port Forwarding, I would still recommend those.

Can you provide the basic system specs of the PC you are having trouble with?

As for this "C++ runtime error, abnormal program termination" message, this may require you to reinstall the game. While doing this, don't just uninstall it from the Steam client, make sure to delete every Final Fantasy XIV file from your computer, then redownload everything. I've seen reinstalling fix the 'Unable to Complete Version Update' issue, however it's not a foolproof method.

Please let us know if one of these suggestions resolved your issue so we can better assist others who may run into the same thing.