I'm not very familiar with IUB, but there have been several posts stating that it includes some version of RUb.
So, to answer your question of whether RUb (and by implication IUb) is installed, just look at the map. Vanilla SH3 has very few ports or cities, RUb has many. For example, is "Lowestoft" present (originally spelled wrongly with a final 'e') on the east coast of the UK? If so, and without the final 'e', you have RUb 1.44 or RUb 1.45 installed and, presumably, all of IUb too. If the final 'e' is still present, you have an earlier version of RUb, and thus presumably an earlier version of IUb.
Stiebler.
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