You can create a new Profile and Game Directory folders for the version of MC you want to play.
Example: if you want a Tech modpack for 1.8.9, you make a Profile and folders for that. If you also want a Magic modpack for 1.8.9, you create a separate Profile and folders for that one. You can name the Profiles something like Tech 1.8.9 or Magic 1.8.9.
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"We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far."