(PKInstallErrorDomain error 106.) (106)

Hi

I've installed an older version of Logic Studio (V2.1, including Logic Pro 9, MainStage 2 and Soundtrack Pro 3) on my Mac running HighSierra (bought 2017 / Processor: 2.3 GHz Intel Core i5 / Memory: 8 GB 2133 MHz DDR4).

Once the install was complete it said I needed to update my version of Logic in order to use it on the operating system.

However, when I've gone to update in the App Store, it comes up with the below error message:

> An error has occurred. The operation couldn't be completed. (PKInstallErrorDomain error 106.) (106).

Now the update isn't even showing in the AppStore, although when I reboot it returns, with the same error message after the update.

Does anyone know why this is happening and what can be done? I would really like to be able to install the software if at all possible.

Thanks for your help