If Java Edition then yes go to the Official website to get the installer again (or get a third party launcher... but it is recommended to get the main launcher again from their official site).
If Bedrock (Win10, IOS/Android or Console) then just go to the store on whichever platform you owned it on, whether it be Windows 10, Console stores or mobile stores and redownload the version you purchased.
I accidentally deleted Minecraft and I cant find how to download it again. if someone can help that will be good.
Depends on what edition you're have. If it is Java edition, then go to Official Minecraft site, where you can download it.
If Java Edition then yes go to the Official website to get the installer again (or get a third party launcher... but it is recommended to get the main launcher again from their official site).
If Bedrock (Win10, IOS/Android or Console) then just go to the store on whichever platform you owned it on, whether it be Windows 10, Console stores or mobile stores and redownload the version you purchased.
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ive got java but how do I get the installer again?
Minecraft.net/download