I installed wallet and run it on testnet
Running symbol-desktop-wallet\Symbol Wallet.exe? .... Which instructions you followed?
I installed this exe file from here, now I see it is 14.0 and you are trying 14.1 (:
https://github.com/nemgrouplimited/symbol-desktop-wallet/releases/tag/v0.14.0Literarily just run it, and after that created new wallet on testnet. It seems working, balance is 0 and I don't know if I should check something else...
In Windows10 there appeared some note from Windows Defender. I think it came with 14.0 and also with 14.1.