Ok - so I wanted to update QlikSense Enterprise Nov 2019 to QlikSense Enterprise 2020. I duly hit the upgrade button and it got so far before stopping with the error message - 'Not enough space available on the C: drive.
OK i thought - I will make some more space on the C: drive and then try again. It turned out that the pagefile.sys file had taken an inordinate amount of space. So I reset the file and had to restart the server to pick up the new settings.
So..tried the upgrade again - immediately failed. Tried to install Nov 2019 version - immediately failed. Tried several times again -still failed - the only thing it suggested was running in silent mode. So tried that and that didn't even start.
I tried various things such as removing the default folders (I backed them up first), looking through the registry but nothing appeared untoward.
So there I was with QlikSense enterprise serving 350 users and not able to run.
Thankfully the server had been backed up 48 hours before - so I had to use that as an image and overwrite the server losing any updates from the last 48 hours.
I would have expected the software to test for all of the prerequisites such as space before starting any kind of upgrade , but it looks like it doesn't until it is too late..and then changes something that is irreversible .. not good.
Salutatory lesson - take a back up directly before upgrading (or try on a mirrored ref environment before hand)..and secondly make sure that the C: drive has sufficient space (look at your pagefile.sys file and adjust as necessary but don't do that after a software installation failure!)
...now what do I do to install Feb 2020
