I probably don't completely understand this, you only need to update go binary, that's all you need to (re)install.
go mod init will handle everything for you.

If you don't want to move to go modules (and it is what you're referring to), switch to 1.12.x and use it with GOMOD111=off.

If you have further questions, please feel free to ask it in any of these forums below:

• Stack Overflow with questions tagged "go"

• The Go Forum, a web-based forum

• Gophers Slack, use the invite app for access. The #general channel is a good starting point.

• Go Community on Hashnode with questions and posts tagged with "go"

• The golang-nuts mailing list

• IRC channel #go-nuts on Freenode

Thanks