RE:if you have to pay maintenance fee, check the LEF of your QlikView Server license. Pay close attention to the product level provision, such as PRODUCTLEVEL;10;;2017-06-29. The date at the end of this line is the date which support maintenance lapses. If the date is in the future, like sometime in 2017, then you are fine and can upgrade to any released version of QlikView. If the date has since lapsed, like 2015-01-01, you can only install versions which were released prior to the date. So given the example date of 2015-01-01, you couldn't upgrade to version 11.20 SR15 as it was only recently released. If you the support maintenance date in your QlikView Server LEF is fairly old, you should contact your account manager in order to be current with your support maintenance.
Thank you very much Chip, for your valuable information.
To add more onto it, after verifying the LEF information I can say that it has lapsed for both development and production environment.
Please see the below Product level information, now I don't understand how to proceed since the Product level information is totally different for Dev and Prod and also it has different dates within the same environment.
QV Server: PRODUCTLEVEL;10;;2014-10-01
QV Publisher: PRODUCTLEVEL;30;;2014-07-01
QV Server: PRODUCTLEVEL;10;;2016-06-29
QV Publisher: PRODUCTLEVEL;30;;2015-06-29
Would you please advise which version do I need to opt.
I encourage you to contact Qlik Customer Service (formerly Qoncierge), as they can assist you with licensing issues and help you get in contact with your account manager to get things straightened out.
Regarding your question on which version you can upgrade to dependent upon the support to date in the LEF files, I would say 11.20 SR7. It is best practices to have your Dev/Prod environments the same, so the Dev Environment Publisher is the date to pay attention to - 2014-07-01. As 11.20 SR7 was released in June, 2014, that is the version available to your current LEF status.
I HIGHLY encourage you to get your maintenace in compliance as the most recent version is 11.20 SR15, so by only upgrading to 11.20 SR7, you would be missing many enhancements and bug fixes. Also, if you do run into any bugs, you wouldn't be entitled to receive support for them.
Hope this helps.