A problem from the past raises its head again!

I have ugraded to Photoshop 2026 and the latest version of Lightroom Classic and am now getting the "The file could not be edited because Adobe Photoshop 2026 could not be launched." message when opening an image from LRC to Photoshop either via the "Edit in Photoshop 2026" option or "Open as Smart Object in Photoshop. I have uninstalled both programmes and reinsatlled with Photoshop first then LRC, to be honest I have done everything that was advised back in 2023 when I had the same issue. This is frustrating as it is a major part of a photographers workflow and I'm sure it isn't only me suffering with this iussue.