Alternate mod dirs for validation and manual installs #1278

Job	Run time
build_NetCore (Debug_NetCore)	1m 19s
build_NetCore (Release_NetCore)	1m 13s
build (6.8, Debug)	1m 41s
build (6.8, Release)	2m 15s
build (6.10, Debug)	1m 36s
build (6.10, Release)	1m 57s
build (6.12, Debug)	1m 30s
build (6.12, Release)	1m 25s
build (latest, Debug)	1m 44s
build (latest, Release)	2m 6s
	16m 46s

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