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Error installing LR4 - digital signature is not trusted

New Here ,
Aug 17, 2020

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Trying to install my old 4.0 version of Lightroom on my macBook Air and receive the error:  "Adobe Photoshop Lightroom 4.pkg can’t be installed because its digital signature is not trusted."

 

I have searched other posts and tried a few suggestions but have not been successfull.

 

Any  ideas?

While LR v4 may be a 64bit app, the installer is not. The installer is 32bit.

 

You can not run a 32bit app in Catalina.

 

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Error installing LR4 - digital signature is not trusted

New Here ,
Aug 17, 2020

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Trying to install my old 4.0 version of Lightroom on my macBook Air and receive the error:  "Adobe Photoshop Lightroom 4.pkg can’t be installed because its digital signature is not trusted."

 

I have searched other posts and tried a few suggestions but have not been successfull.

 

Any  ideas?

While LR v4 may be a 64bit app, the installer is not. The installer is 32bit.

 

You can not run a 32bit app in Catalina.

 

Topics

Download and install

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44

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Adobe Community Professional ,
Aug 17, 2020

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Which version of MacOS is running on your MacBook?

 

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New Here ,
Aug 17, 2020

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macOS Catalina 10.15.6

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LEGEND ,
Aug 17, 2020

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Lightroom 4 cannot be installed on Catalina.

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LEGEND ,
Aug 17, 2020

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While LR v4 may be a 64bit app, the installer is not. The installer is 32bit.

 

You can not run a 32bit app in Catalina.

 

Just another Adobe customer; My Sys; APP: LRC 9.4, PS 21.2.1; CMP: WIN WS 16GB OS 10 v1909 (18363), mid 2015 MBPr 15” 16GB MACOS 10.15.6; 4K EXT DSPY; CAM: Canon 5D Mk III, Fuji X-T3

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Adobe Community Professional ,
Aug 17, 2020

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Boot into an older OS that CAN support a 32-bit installer (like Mojave), install, then you should be able to run LR, at least I can run LR5, under Catalina. LR4? Maybe, maybe not. 

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