Cannot import an old business after software update

I updated to the latest version TODAY. I had an existing business, which I cannot import into the new software through the “Import Business” function. The existing business was last updated about 2-3 months ago. I reinstalled Manger several times. The icons on the backup file that I am importing (the existing business) remain blank, i.e. they do not take the Manger icon. I need URGENT help, if anyone knows a solution.

What edition? Version? Please illustrate with screen shots. And why do you need to import an existing business?