Depends which licence you have.

Jason keeps the current Base and the current Sub-release in the
relevant download directory. You will not find any other releases
there. Usually ( and if there is a problem found doing this it
is fixed very quickly ), you just copy the latest sub-release
over the same Base set and re-build.

I tend to keep a copy of the working set-up, and rebuild in a new
directory with a clean copy of the base and sub-release, but that
is just my preference.

--
Lester Caine
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L.S.Caine Electronic Services