serious problems with sierra 10.12.6
After installing riseupvpn on mac os sierra ver 10.12.6 in the program directory and after an error occurred, an attempt was made to install it on the desktop. After restarting the computer, problems started. The account does not allow opening previously installed programs, as well as all documents and folders disappeared from the desktop. I demolished the riseup vpn program, but unfortunately, it does not help. I very much ask for help and apologize for my English and complete misunderstanding in the situation (I am a noob). Thank you!