Upgrade failed so did trying to reinstall old version

Hi

I have been using Manager since 2019 version 19.11.22 and decided to upgrade.

That didnt go well as the new program wont load any data. I uninstalled everthing and did a new install then tried to add my businesses from the back up. that didnt work all i get is this

no matter how long i wait it wont load.

I then tried to install the old version and it wont install I tried to put a screen shot but it will only let me add 1 attachment

Any help would be much appreciated. Thanks