@Carp_Universum Extension:Arrays is declined as it is not currently maintained. We also already have two different DPL extensions installed, could you check to see if either of those will work for you?
The reason why I need 3rd Part DPL is because my old wiki used it, when I was on Fandom/Wikia, they use that one, so the advanced templates I made with it will only work with that extension, I tried the other one and it did not work. Is there any Eta for this extension to be enabled then? Thanks!
Unfortunately there is no ETA for the extension to be enabled. All new extensions that are not in use by at least one Wikimedia Foundation project must undergo a security review (to check for vulnerabilities in the backend code, among other things). Our two main security reviewers, @Southparkfan and @Samwilson, tend to be quite busy with other things, and therefore security reviews can take a long time (sometimes even multiple months).
3rd Party DPL, declined.... It did end up doing the same thing as the current DPL 3 extension...no reason to have yet another DPL extension that is an older version of one we already have. The WSArrays extension will require for more extensive review, because of its complexity.