Rikka / Rikka AI Lite versions

[SarielV]

Available after you agree to the terms at the bottom of the page.
(also has Saki, Saki AI, and KotonohaAkane/Aoi Lite)

https://www.ah-soft.com/trial/synth-v.html

[michu]

Also, https://resource.dreamtonics.com/download/ will have them as well!
(This is the official download site for lite voicebanks if you scroll down on the dreamtonics website.) It has Aiko lite, Chiyu lite, Eleanor lite, Genbu lite, Rikka AI lite, Rikka lite, Saki AI lite, and Saki lite!