I found out that Simpe is trying to find the .exe file in Double Deliuxe, but because it's Ultimate Collection, the .exe file is in the latest one, which is the Mansion and Garden under Pets. It's because Simpe is outdated, I have the latest one according to the website.
There are several things, including a few paintings, that I am not getting. Nothing I can do about it, as it is a Simpe issue, not a game issue.
I did find a large enough painting on Mod the Sims, so that's fine.