In chronological order:
fuckyouplusplus - Split version for a model that was crashing Hammer++ to be removed temporarily. Very early. No assets packed. (March 2021)
prerelease - A few weeks before b1, minor differences. (August 2021)
b1 - Released alongside Interloper Beta 1.3. (August 2021)
b2 - Revamped garden area. (October 2021)
c2 - Fixed CSS asset conflicts. (November 2021)
v1 - Re-used assets to cut down on file size. Workshop release. (Christmas 2021)
il_v1 - Optimizations and patched out of bounds spot. No assets packed (downloaded through server). (June 2022)
v2 - il_v1 with assets packed + easter egg. (September 2022)

There's also about 290 screenshots in Pre-Release Materials if you want to see more of this map's development.