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I am writing a table with colored rows using the tabupackage (2.10). For example

documentclass[12pt]article
usepackagetabu
usepackage[table]xcolor
begindocument
begintable
 rowcolors2redblue
 begintabucc
 toprule
 Row1 & A \
 Row2 & B \
 Row3 & C \
 bottomrule
 endtabu
endtable
enddocument

I have also tried with taburowcolors 2red ... blue but the colors never show up at all.

I am aware of the issue at the github repo https://github.com/tabu-fixed/tabu/issues and even after manually updating to the 2.10 release, the problem still persists for me.

Does anyone know if the problem has been fixed? If so, how can I get the colored table.

It is worth to mention that I am using the tabuenviroment as I will be using the columns with custom lengths X[n]. Is there any other alternative to tabu where I can set up the length of the columns?

like this?

Why not use tabu package is explained in comments below your question ...

Solution can be use tabularx instead of tabu and boldline for horizontal lines with adjusted thickness (instead booktabs rules, which have (white) space above/below rule):

documentclass[12pt]article
usepackageboldline% for rules, part of Shipunov bundle
usepackagetabularx
newcolumntypeC>centeringarraybackslashX
usepackage[table]xcolor
newcountertblerows% see https://tex.stackexchange.com/questions/297345/
 % why-is-the-start-row-of-rowcolors-ignored-in-tabularx
expandafterletcsname c@tblerowsendcsnamerownum

begindocument
begintable
 rowcolors2red!30blue!30
 begintabularx0.5linewidth>hsize=1.5hsizeC
 >hsize=0.5hsizeC
 
 hlineB2
 Row1 & AA AA \
 Row2 & B \
 Row3 & C \
 hlineB2
 endtabularx
endtable
enddocument

The same question has been submitted in GitHub, see Simplest MWE to have an alternating row color #18. The proposed solution for the version v2.9 2019/01/11 of tabu comments some commands, see Figure. For further details, please check the solution provided in GitHub.

I try this fix in tabu.sty (v2.9) and does what you are looking for. Maybe it will be fixed in the next release of tabu.

In any case, please consider the above remark of Ulrike Fisher and thus the solution proposed by Zarco.