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Subsequent expenditure on software

Could you please help with the following topic.

Software is acquired in 2012 and depreciated over 5 year term with 20%. In 2016 subsequent acquisition (upgrade of the software is made that meets the criteria according to the standard). The question is how the asset will be depreciated in future since there are different parts acquired on different dates. Is the initial investment depreciated only until 2017 and the upgrade until 2020 or what is the case?