Usually i have an additional c-plus directory with tools, unpackers etc. ready to migrate to every new install via WinUAE, so i have LHA and DMS and so on ready. Same goes with MUI, keep an installation in its own directory and use a muisetup script instead of the entries in user-startup you write only execute s:muisetup.
So you donot need to install again, given you are using the same level of CPU, like 020+.