I have installed forge 1.5.2-forge-31.2.0 on java minecraft 1.15.2 and then downloaded the latest Dalek  mod . I get error message Dalek+mod-+.jar is for an older version of Forge and cannot be loaded.

Do I need to install an older version of Forge, and if so which one?

Many thanks

its 1.12.2 you have to be in

if this means what i think it means

i think you need to get the most recent update of dm

if this means what i think it means

i think you need to get the most recent update of dm

i apologise for the spam it was a misclick 

but anyway you need 1.12.2