Of course, it’s available on ubi. The main thing is to choose the one that suits your version.
You need heroes_might_magic_5_1.06_eu.exe, heroes_might_magic_5_1.06_eu_collectors.exe, or heroes_might_magic_5_1.06_us.exe. http://patches.ubi.com/heroes_might_magic_5/
Judging by the size, the English 1.6 patches are not cumulative. Although, I might be wrong, as I installed the Russian patches. Then you need to start with 1.4.
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