Hi and welcome to devnet forums
The versions are determined by availability on the repository servers. Since there are a "mass" of different compiler versions around Qt libraries are only build for some selected versions.
The best is to install the same version of a pre-built Qt libs as the compiler is you have installed. Especially with MSVC compiler there is almost no compatibility between subsequent versions. However, IIRC there is a compatibility between MSVC2015 and MSVC2017 versions. For sure there is no compatibility to or between previous versions.
Also you cannot mix 32-bit and 64-bit versions.
However, since you have a qt-enterprise version, it should mean that you have a commercial version with license, if I amnot mistaken. When you have a commercial license you are entitled to get support from the commercial hotline.
This is the open source forum.