Lightroom 4 Installing Problem

[Arnold5EE3]

Hello

I'm Trying to instal Lightroom 4 from my original instalation dvd on Mac Os 10.15.7

I'm getting the following error: ''Adobe Photoshop Lightroom 4.pkg cannot be installed because the digital signature cannot be trusted.''

What could i do to instal the Software?

Thank you

[Rob_Cullen]

TBMK (as a Windows user) OS 10.15.7 'Catalina' will only install 64bit software (as does Big Sur).

Lightroom v4 is 32bit software and cannot be installed in 10.15.7

v4 may have worked if it was installed before the OS was upgraded, but now I suggest v4 is 'dead' for you.

Time to upgrade to v10 with a subscription to the Photography Plan (20Gb).