After installing a fresh 2.0.0 and immediately running an upgrade of 2.0.1 with an option of backup, it did the upgrade (which I have not yet checked), but it gave the following error at the end.
An error occured:
Modification of a read-only value attempted at
/xxx/xxx/install.cgi line 6522.
An error occured:
Modification of a read-only value attempted at
/xxx/xxx/install.cgi line 6522.