I downloaded the latest version of Avogadro2 (1.91.0), but it appears I can't open a .cif file in this software. Is there a way around this? In an earlier version of Avogadro, I remember being able to open a .cif file.
tldr; Try one of the [nightly builds](https://nightly.link/OpenChemistry/avogadrolibs/workflows/build_cmake/master)
Avogadro uses Open Babel to read CIF files, and unfortunately, OB versions before v3 would break molecules such that all atoms fit within the unit cell. Typically, most people would rather have a contiguous molecule even if it goes through a unit cell. So for molecular crystals, I'd highly recommend using Avogadro2 betas.
(To be honest, that's what I use everyday - and I'd rather get complaints or bug reports than 1.2, which would be essentially impossible to fix.)
Unfortunately, it seems as if binaries weren't built for the 1.93 beta of Avogadro2. (It's marked as beta because it doesn't have all the features from the 1.x series yet.)
My goal is to get a 1.94 release out soon, but GitHub has automated builds available through nightly.link: