Greasy Fork

怎么才能把下载的脚本保存到本地，不然每次更新都要重新下载脚本，也不好将脚本分享到其他的电脑上

The downloaded script disappears every time the plug-in is automatically updated and needs to be downloaded again

This translation may be inaccurate, but could you clarify your problem again? Greasy Fork is not the installer so probably not the problem.

Which "plugin" do you use, Grease Monkey, TamperMonkey etc? What is your browser? Which script disappears? Is it one you developed or a script listed on Greasy Fork?

How can I save the downloaded script locally, otherwise I will have to re-download the script every time I update, or share the script on other computers?

It should be enough to press "install" from Greasy Fork. Downloading locally shouldn't be difficult, but the "plugin" should do a better job keeping it up-to-date automatically. For multiple computers you can install separately or look for a sync option in the "plugin".