早前安装的tiup。近期想进行tiup自身升级，安装环境
虚拟机 Red Hat Enterprise Linux Server release 7.2 (Maipo)
执行tiup update --self命令，报如下错误。
tiup update --self
Error: download from https://tiup-mirrors.pingcap.com/tiup.sha1?v=1597375997618301561 failed: server returned 404 Not Found
Tiup的版本信息：
]# tiup --version
tiup version v0.0.4 tiup
Go Version: go1.13
Git Branch: master
GitHash: f74f86a
Build Time: 2020-04-10 15:01:40 +0800
执行 tiup list --refresh 命令正常：
tiup list --refresh
Available components (Last Modified: 2020-02-27T15:20:35+08:00):
Name Installed Platforms Description
tidb darwin/amd64,linux/amd64,linux/arm64 TiDB is an open source distributed HTAP database compatible with the MySQL protocol
playground darwin/amd64,linux/amd64,linux/arm64 Bootstrap a local TiDB cluster
client darwin/amd64,linux/amd64 A simple mysql client to connect TiDB
package darwin/amd64,linux/amd64 A toolbox to package tiup component
cluster darwin/amd64,linux/amd64,linux/arm64 Deploy a TiDB cluster for production
mirrors darwin/amd64,linux/amd64 Build a local mirrors and download all selected components
bench darwin/amd64,linux/amd64,linux/arm64 Benchmark database with different workloads
ctl darwin/amd64,linux/amd64,linux/arm64
tiup darwin/amd64,linux/amd64 TiUP is a command-line component management tool that can help to download and install TiDB platform components to the local system
server darwin/amd64,linux/amd64,linux/arm64 TiUP publish/cache server
如果卸载tiup，重新安装的话，是直接删除".tiup"目录即可吗？
谢谢
