In case this helps anyone, I was having trouble with this too but managed to fix it. It was really bad trouble reinstalling LR6 actually because it turns out that although the app is 64 bit, the installer is 32 bit. So that means downgrading from MacOS Catalina to Mojave, though it should theoretically be possible to upgrade again after finishing with the installer. My initial loss of LR6, by the way, was caused by installing Creative Cloud and then logging in to an enterprise CC account for Photoshop. CC somehow took over my LR6 and insisted on rebranding it to LR2015.CC and declaring it unlicensed and function-limited (no develop mode). Uninstalling that CC did not solve this and I was left with an unusable LR. Anyway, the answer that actually worked, after downgrading MacOS was this: 1. Install the LR6.0 as originally purchased. 2. Install the 6.14 patch. Note: don't download the latest LS11 that's available from Adobe until August 2022, it's 6.12 and won't accept the patch. 3. Make a clean install of the Creative Cloud app. 4. Then run LR6. The activation part that had been saying "please connect to the internet" seems to find its way via the Creative Cloud app.
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