Hello, I do not know if this is exactly the same issue as us, but we are running into a failure during a Major Upgrade of a Chain as well. We have 5 main apps in our chain. 2 of these app installers (.msi) have removal conditions on them that will not allow them to uninstall if any dependency apps still exist on the system. So our original chain will install and uninstall these apps in the correct order. This works fine, but now we created a major upgrade that has the main chain as well as all chained .msi projects major upgrades. So we are appling this major upgrade install over the original version and it fails because it tries running the first chained install in major upgrade mode and it will fail because of the uninstall condition if anything still exists. I know this was not that great to add to the installer, but we were not thinking correctly..... Anyways we thought that the Major Upgrade of the main Chain would actually uninstall all products it installed first before installing all chained products that are built in to it. Is this what it is suppose to do??? In the log it shows the following command line: MSI (s) (B0!68) [10:01:19:387]: PROPERTY CHANGE: Adding IS_CHAINER_POST_COMMANDLINE property. Its value is '/qb /x{9D81615E-B150-488B-90CA-1159E2113BE3} /qb /x{3ABF6865-E84E-4DAB-B730-0EB9E8F37EB1} /qb /x{ED0FF410-41B9-441F-B457-4AC81782E8BF} /qb /x{67E6410C-1E97-4D03-BEC2-8E83323A6BBD} /qb /x{0E5DD7A3-BE29-430C-970B-C553F4A58C39}'. These are the correct product codes for the products installed and in the correct uninstall order, but this does not seem to get triggered. So Again is a major upgrade of a chain suppose to uninstall everything it installed first before installing the chained products or is it suppose to simply uninstall it self, then reinstall it self and trigger the installs of the chained installer. At this point if they are major upgrades then they simply handle themselves??? If this is the case then I have to figure out how to get those 2 main products that do not uninstall to be uninstalled.... Thanks for any insight into Chained Major Upgrades... ... View more