The developers of games like this usually fund their work through platforms like Patreon. By becoming a patron, you get access to the latest builds (including betas) directly from the source.
The v1.6.01 Ex Beta version is a community-released "complete" version of the first game. As it is not an official commercial release, it is available as a free download from various gaming forums and archival sites. However, caution is advised when downloading from unofficial sources. My Cute Roommate -v1.6.01 Ex Beta- Download -FREE
To install the v1.6.01 Ex Beta version on your device, follow these steps: The developers of games like this usually fund