TIBCO Nimbus are discontinuing support for older versions of the software, as stated in their official notice:
On July 16, 2015 TIBCO announced plans to officially discontinue the following: TIBCO Nimbus, previously known as TIBCO Nimbus Control or Nimbus Control versions 8.1.x and 9.0.x:
TIBCO Nimbus versions 9.0.x and 8.1.x (LBN 44491)
We will discontinue support for the listed products version(s) on July 31, 2016. Until that time, Support will answer product questions, but enhancements and service pack releases will not be provided. If you are still using this product version, we request that you migrate, as soon as possible, to a supported release of the product. Check the TIBCO Product Download Site (eDelivery.tibco.com/) for the most recent release when planning your upgrade.
Extended Support will not be available.
Additional information about this support policy may be found in the LBN(s) listed above, at support.tibco.com. If you have any questions regarding this notice, or are interested in migration assistance from our Professional Services Group, please contact your TIBCO Account Executive. Please disregard this notice if it does not apply to you, or you do not have maintenance on the above product(s).
TIBCO Global Support
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It is recommended that Nimbus customers plan their upgrade to a supported version well in advance of the date their support is discontinued.