Turbotax install fails on my Macbook, message says read only file

I just purchased turbotax 2025 premier for Mac (MacOs Tahoe 26.1) & received the software activation key from Costco. I downloaded the .dmg file and moved it to my applications folder but when I try to open Turbotax from applications as the instructions state, I get a message that says" TurboTax is on a read-only volume.

TurboTax can't be updated when it's running from a read-only volume like a disk image or an optical drive. Move TurboTax to your Applications folder and relaunch it from there". I have used Turbotax since 2015 on my various Macbooks but this is the first time I'm getting a message like this. I have reinstalled it 3 times and also rebooted my Mac multiple times. Any help would be appreciated. Thank you.

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