When you install the software, you can install on the inactive partition and choose NOT to do the reboot when the installation is finished. during maintanance window, do what Manish says, but remember, any possible language pack, or other option (.cop file) that you have on your current version of cucm, you will need to install that on your 8.6.2 version as well.
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Just thought i would add my couple pence, when upgrading the pub allow for a considerable more time for upgrading than before, probably double the amount of time due to the "refresh" upgrade as helpfully noted by Rob..When i did this for the first time i thought it had crashed and nearly aborted :-)
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...