You don’t have to. There are three SMB versions, v1, v2, and v3. ROCK supports v2. Microsoft disabled v1 in Windows by default because it is outdated, but it does not matter because ROCK supports v2.
However, some Windows versions (like probably Enterprise) have also disabled access to SMB (v2) shares that don’t require a username and password, because it is not secure in enterprise networks if everyone has access to a share. On affected Windows versions, this must therefore be enabled explicitly.
There was some confusion on the forum a while ago wether ROCK supports only SMB v1, and thus whether the problem was SMB v1 support in Windows or the limitation with the password-less guest access. However, this was clarified in lengthy discussions. ROCK does support SMB v2 and hence enabling SMB v1 is not necessary in Windows. However, allowing the guest access may be.
Microsoft documented this here and explains how to enable it, like Geoff already posted:
Which isn’t necessary 
I would but the forum software is acting up for me, it takes ages to load any page, if it does at all. If you search for smb v1 and insecure guest access, you can surely find them
Edit: Works better now but for some reason I can’t find the long thread from a few months ago where people specifically forced their clients to only use SMBv2, checked SMB connection logs, etc., and it was proven that SMBv2 works with Roon OS / ROCK. I guess you remember