I came across this thread as I have just had the same issue of having to reinstall pastel on a new laptop.

I have managed to follow the steps that you gave suggested successfully, but when I try to open the company an error pops up saying that the company was created in a newer version of pastel.

So I had a look at the version on the old laptop which is 11.1.2 and on the new laptop I have installed the original version from the cd which is 11.1.1

How do I overcome this issue without pastel support?

Thank in advance.