qBittorrent official forums

Currently for Windows machine. There are 4 version to download

64-bit installer Uses Qt5 and libtorrent 1.2.x series.
64-bit installer (lt20 qt5) Uses Qt5 and libtorrent 2.0.x series.
64-bit installer (qt6) For Windows 10+. Uses Qt6 and libtorrent 1.2.x series.
64-bit installer (lt20 qt6) For Windows 10+. Uses Qt6 and libtorrent 2.0.x series.

Since libtorrent 2.0.x is freely available. Why not just ask the user to install libtorrent 2.0.x and only provide the following 2 versions.
64-bit installer (lt20 qt5) Uses Qt5 and libtorrent 2.0.x series.
64-bit installer (lt20 qt6) For Windows 10+. Uses Qt6 and libtorrent 2.0.x series.

Can someone explain what all this means? I recall I had to use a special version to avoid tiny text but after it upgraded itself the tiny text is back.
I'm sure there are now even more versions and I have no clue, even after searching.