No problem with my upgrade.
I wanted to alert you that the link on the website to NagiosXI 2012R2.8c still points to 2012R2.8b. I simply copied the URL and changed it accordingly to get the correct code.
Link to 2012R2.8c points to 2012R2.8b
Re: Link to 2012R2.8c points to 2012R2.8b
All fixed. 2.8c is as of this moment the latest release.
Former Nagios employee