Error installing LR4 - digital signature is not trusted

Forum|Forum|5 years ago
August 17, 2020
3 replies
1599 views

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?

Download and install

This topic has been closed for replies.

Correct answer GoldingD

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.

TheDigitalDog

Inspiring

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.

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

GoldingDCorrect answer

Legend

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.

AxelMatt

Community Expert

Which version of MacOS is running on your MacBook?

My System: Intel i7-8700K - 64GB RAM - NVidia Geforce RTX 3060 - Windows 11 Pro 25H2 -- LR-Classic 15 - Photoshop 27 - Nik Collection 8 - PureRAW 6 - Topaz Photo AI

january01smithAuthor

Participant

macOS Catalina 10.15.6

dj_paige

Legend

Lightroom 4 cannot be installed on Catalina.

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