I want manually install the Telerick Web Part for SharePoint, but I don't understand how do download the .wsp file or where find it.
I just found the Telerik_Web_Parts_For_Sharepoint2013_2020_2_512_Dev.msi.
Thanks in advance
Please go and log into https://www.telerik.com/account/product-download?product=AJAX%20SP, download and extract the Telerik_Web_Parts_For_Sharepoint2013_2020_2_512_Dev.zip archive. It contains the RadControlsSP.wsp, you are looking for: