Aside from that, the officially supported version of estrus is 1.20, you have 1.99. I never tried if the addons would still work with newer versions of Estrus, but there is a pretty good chance they don't... make sure you use a new game or a save before installing Estrus the fist time at least for testing, if it works there you can try to get it working with your current save using save game cleaners to remove all estrus scripts after uninstalling and before installing the older version.
If that does not help I dont know how dependend estrus spider is in terms of the actual estrus chaurus version since estrus chaurus just got a update and estrus spider didnt. I could imagine if spider is build on the chaurus version that it needs a update, but thats just a assumption as I dont know the details about those mods. If the mcm continues to not show you may should ask in that mod topic if other have a similar issue.
Estrus For Skyrim V1.20
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