Works for me in Qubes Debian based VM.
Remove eventually old copies of it.
(I prefer using
trash-put because if you are using
rm and mess up adding a space
~/ sandbox then you end up deleting your whole home folder.)
Trying to upgrade the old version failed for me.
2017/01/25 10:19:34 launch: Failing with error: dynlib: Failed to find library: libasan.so.2
Didn't investigate since starting to use the new version worked for me.
For your convenience:
gpg --recv-keys "EF6E 286D DA85 EA2A 4BA7 DE68 4E2C 6E87 9329 8290"
gpg --verify sandbox-0.0.3-linux64.zip.asc
Don't forget the Qubes workaround.
sudo umount /prox/xen