Primeng: [6.1.0-rc.1][CSS & Style][Theme Omega] Severity Buttons not working

[visat09]

[x] bug report => Search github for a similar issue or PR before submitting
[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

Current behavior
theme Omega
all css class not working
.ui-button-secondary
.ui-button-success
.ui-button-info
.ui-button-warning
.ui-button-danger

• Angular version: 5.X
  
  5.0.0

• PrimeNG version: 5.X
  
  6.1.0-rc.1

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
  
  Version 67.0.3396.99 (Official Build) (64-bit)

• Language: [all | TypeScript X.X | ES6/7 | ES5]
  all

• Node (for AoT issues): node --version =
  v8.9.1

I found something

I checked css class in file "../node_modules/primeng/resources/primeng.min.css".
I not found button style class in primeng version 6.1.0-rc.1
but in version 5.2.6 it does not disappear.

[cagataycivici]

Omega free theme is deprecated, you need to migrate to newer themes like Nova. Severities are responsibility of the themes as of 6.1 which Omega does not support.

Note that for Omega Template users, Omega will be reimplemented with Designer.

[guialro]

So, once I cannot install these newer themes because I didn't found any documentation to this at Document Setup simply because the links don't work, how can I downgrade the version through NPM?

[guialro]

npm uninstall primeng --save
npm cache verify
npm install [email protected] --save

C:\Dev\Projetos\****\Desenvolvimento\WEB\web>npm uninstall primeng --save
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

up to date in 10.541s

C:\Dev\Projetos\****\Desenvolvimento\WEB\web>npm cache verify
Cache verified and compressed (~\AppData\Roaming\npm-cache\_cacache):
Content verified: 2218 (104157560 bytes)
Index entries: 3494
Finished in 3.266s

C:\Dev\Projetos\****\Desenvolvimento\WEB\web>npm install [email protected] --save
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

+ [email protected]
updated 1 package in 12.499s

[visat09]

@guialro migrate to primeng 6.0+