I use calibre generally a couple times a week, and always upgrade to the latest version when I notice the friendly little reminder up in the corner
Usually, after upgrading, next time I open the program I notice that the version information is updated accordingly.
So, today I log in and see that version 0.6.19 is available. My current version was listed as 0.6.18. I click on the download link and do the upgrade like I normally have, only this time after going through the download process and restarting the program, it immediately came up with the option to upgrade to version 0.6.20 and showed the current version as 0.6.16
So first I figure "huh?" and then I figure "whatever, I'll just do it again for the new one"... except when I click on the download link, I notice the little tidbit at the top of the page advising me
"If you are upgrading from a version older than 0.6.17, please uninstall calibre first.".
So now I'm not sure what to do. I was on version .18 tried to upgrade to version .19, now it says I've got .16 and wants me to uninstall before upgrading to .20 ... I'm scared to uninstall! Will I lose all my painstakingly formatted and metadata'd library if I uninstall? Or should I just forget about upgrading altogether and just leave well enough alone? Help!