I have the same problem. My computer is an old one with Win7 installation. I have no other and don’t want to buy a new one just to check my Trezor wallet. I have expensive programs which would be lost if I install new / change the computer.
How can I get back to the old trezor suite?
Windows 7 are out of support, meaning they no longer receive security updates. It’s dangerous to connect such computer to the internet, more so if you use it to manage your cryptocurrency savings – sure, malware can’t hack your Trezor, but it can mess you up in other ways, like changing your sending and receiving addresses when you paste them from clipboard.
If you cannot upgrade for any reason, you can either connect your Trezor to an Android phone, if you have one, or get yourself a bootable USB stick with a Linux distro such as Tails. Trezor Suite runs perfectly fine under Tails.