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"When I tried to create a new environment, only Python 3.8 was offered." - Have you tried something like conda create --name YourEnvName python=3.7 anaconda?
@Anaksunaman Yes, just did that in fact, but it's a plain environment and - IIRC - previously I could create with py (3.6), 3.7, 3.8 and get a copy of the base with the right python version - or am I misremembering?
conda create --name YourEnvName python=3.7 anaconda
?