Are you using an ARM processor?

I also have this error, and to answer the one query, I am running Windows 11 inside Parallels ARM Virtual Machine on a Mac which has always updated perfectly before. I have run all the actions advised.

I resolved this on my client's machine - Windows 11 inside Parallels ARM Virtual Machine on a Mac - by installing the 32bit version of Sage 30.1.343.0. This installed with no issues.

Oh Amazing! This has worked perfectly. Thank you so much for your reply.

No problem, happy to help. It took me a bit of trial and error and several failed 64 bit installs before I thought: well, let's try the 32bit version....!

Interestingly during this whole process I checked for an update for Windows and it offered me: "2024-09 Cumulative Update for Windows 11 Version 22H2 for arm64-based Systems (KB5043076)" which I then updated.

After that, I thought I had done a re-start before I tried (yet again) to install the 64bit version, but I've just seen that it is still requesting a re-start, so maybe that would have fixed it. I will do the re-start and at some point try to install the 64bit software (maybe at the next upgrade). 

Anyway, that may help you or someone else with the same issue right now.