no se pudo instalar dropbox error

No puedo instalar dropbox en la computadora. Me da este error. 

bn.BUILD_KEY: Dropbox
bn.VERSION: 85.3.138
bn.DROPBOXEXT_VERSION: 27.0
bn.is_frozen: True
machine_id: 8d8e4146-ebd9-42d7-838f-be72b53d278a
pid: 6276
cwd: 'C:\\WINDOWS\\SysWOW64'
real_path='C:\\WINDOWS\\SysWOW64'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
HOME: None
appdata: 'C:\\Users\\usuario\\AppData\\Local\\Dropbox\\instance1'
real_path='C:\\Users\\usuario\\AppData\\Local\\Dropbox\\instance1'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
dropbox_path: 'C:\\Users\\usuario\\Dropbox'
real_path='C:\\Users\\usuario\\Dropbox'
mode=0o40555 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
sys_executable: 'C:\\Program Files (x86)\\Dropbox\\Client\\Dropbox.exe'
real_path='C:\\Program Files (x86)\\Dropbox\\Client\\Dropbox.exe'
mode=0o100777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
trace.__file__: 'C:\\Program Files (x86)\\Dropbox\\Client\\85.3.138\\python-packages-37.zip\\dropbox\\client\\ui\\common\\boot_error.pyc'
real_path='C:\\Program Files (x86)\\Dropbox\\Client\\85.3.138\\python-packages-37.zip\\dropbox\\client\\ui\\common\\boot_error.pyc'
not found
parent not found
TMP: C:\Users\usuario\AppData\Local\Temp
TEMP: C:\Users\usuario\AppData\Local\Temp
tempdir: 'C:\\Users\\usuario\\AppData\\Local\\Temp'
real_path='C:\\Users\\usuario\\AppData\\Local\\Temp'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
Traceback (most recent call last):
File "dropbox\client\authentication\manager.pyc", line 928, in _on_register_host_success
File "dropbox\client\authentication\manager.pyc", line 1212, in _handle_joining_leaving_cdm_team
File "dropbox\client\relocate_namespace_folders.pyc", line 727, in execute_pending_operations
File "json\__init__.pyc", line 348, in loads
File "json\decoder.pyc", line 337, in decode
File "json\decoder.pyc", line 355, in raw_decode
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)