Planting 7–8 foot Norway spruces in July is the worst-case scenario. Heat + transplant shock = needle browning and branch dieback. The 3-day watering gap during 100°F weather likely caused the damage you're seeing.
Contact the installer/nursery immediately. Most guarantee trees for 1 year if planted by them. Document condition with photos. If replacements needed, insist on fall planting.
Large evergreens need spring or fall planting. Summer installation requires daily monitoring and often fails despite best efforts.
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