Adobe lightroom for mac 5.7

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I won't be able to open LR, and will loose all the program's functionalities.Question: when upgrading to mac OS version 15, what I should expect to happen? I am aware that 32-bit software won't be supported any longer.

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Now, when stating up LR, sometimes (not every time!) I get a warning message like this 'this software will not be supported on the next release of MAC OS - contact the developer'. I have as iMAC and a MacBook, both running Mojave, and with Lightroom version 5.7.1 installed on both.