✔ 最佳答案
(1) The company has developed personalised versions ...
留意 "versions" 是複數,這意味著有幾個版本。
If you want to use personal pronoun to refer to "personalised versions", you must use "they" instead of "it".
(2) but this is the first version that ...
However, "they" does not fit into the meaning of the sentence, because the subject is a singular noun phrase "the first version".
Therefore, the most appropriate pronoun to be used here is the demonstrative "this" or "that" to indicate a particular version, which I believe has been mentioned before this paragraph.